Exhibit 24

                                POWER OF ATTORNEY

      The undersigned, a Director of Marsh & McLennan Companies, Inc., a
Delaware corporation (the "Company"), does hereby constitute and appoint any one
of A. J. C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van
Gundy to be the undersigned's agent and attorney-in-fact, each with the power to
act fully hereunder without the other and with full power of substitution to act
in the name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                          /s/ Norman Barham 
                          ----------------------------
                          Norman Barham





                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

     To sign or to transmit electronically in the name and on behalf of the
     undersigned, as a Director of the Company, and file with the Securities and
     Exchange Commission on behalf of the Company an Annual Report on Form 10-K
     for the year ended December 31, 1998, any registration statements for the
     registration of the Company's common stock and related interests to be
     issued pursuant to the Company's duly adopted employee benefit,
     compensation and stock plans, any registration statements for the
     registration of the Company's common stock for issuance in connection with
     acquisitions or for resale by the holders thereof who acquired or will
     acquire such stock in connection with past or future acquisitions, and any
     amendments or supplements to such Annual Report on Form 10-K and such
     registration statements; and

     To execute and deliver, either through a paper filing or electronically,
     any agreements, instruments, certificates or other documents which they
     shall deem necessary or proper in connection with the filing of such Annual
     Report on Form 10-K, registration statements and prospectuses and
     amendments or supplements thereto and generally to act for and in the name
     of the undersigned with respect to such filings as fully as could the
     undersigned if then personally present and acting.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                     /s/ Lewis W. Bernard 
                     ------------------------------
                     Lewis W. Bernard



                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ Frank J. Borelli 
                          ---------------------------------
                          Frank J. Borelli




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ Peter Coster 
                          -----------------------------
                          Peter Coster




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ Robert F. Erburu 
                          -------------------------------
                          Robert F. Erburu






                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ Jeffrey W. Greenberg 
                          -------------------------------
                          Jeffrey W. Greenberg




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ Ray J. Groves 
                          -------------------------------
                          Ray J. Groves




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ Stephen R. Hardis
                          ---------------------------------
                          Stephen R. Hardis




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ Gwendolyn S. King 
                          ---------------------------------
                          Gwendolyn S. King




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

     IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                     /s/ The Rt. Hon. Lord Lang of Monkton
                    ------------------------------------------
                    The Rt. Hon. Lord Lang of Monkton




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.


                           /s/ Lawrence J. Lasser 
                          --------------------------------
                          Lawrence J. Lasser




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ David A. Olsen 
                          -------------------------------
                          David A. Olsen



                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ John D. Ong 
                          ---------------------------
                          John D. Ong




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ George Putnam 
                          ------------------------------
                          George Putnam




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ Saxon Riley 
                          ------------------------------
                          Saxon Riley




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                      /s/ Adele Smith Simmons
                     ---------------------------------
                     Adele Smith Simmons




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                          /s/ John T. Sinnott
                          ------------------------------
                          John T. Sinnott




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                           /s/ A. J. C. Smith 
                          -----------------------------
                          A. J. C. Smith




                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                          /s/ Frank J. Tasco
                          ---------------------------
                          Frank J. Tasco






                                POWER OF ATTORNEY

     The undersigned, a Director of Marsh & McLennan Companies, Inc., a Delaware
corporation (the "Company"), does hereby constitute and appoint any one of A. J.
C. Smith, Jeffrey W. Greenberg, Frank J. Borelli and Gregory F. Van Gundy to be
the undersigned's agent and attorney-in-fact, each with the power to act fully
hereunder without the other and with full power of substitution to act in the
name and on behalf of the undersigned:

      To sign or to transmit electronically in the name and on behalf of the
      undersigned, as a Director of the Company, and file with the Securities
      and Exchange Commission on behalf of the Company an Annual Report on Form
      10-K for the year ended December 31, 1998, any registration statements for
      the registration of the Company's common stock and related interests to be
      issued pursuant to the Company's duly adopted employee benefit,
      compensation and stock plans, any registration statements for the
      registration of the Company's common stock for issuance in connection with
      acquisitions or for resale by the holders thereof who acquired or will
      acquire such stock in connection with past or future acquisitions, and any
      amendments or supplements to such Annual Report on Form 10-K and such
      registration statements; and

      To execute and deliver, either through a paper filing or electronically,
      any agreements, instruments, certificates or other documents which they
      shall deem necessary or proper in connection with the filing of such
      Annual Report on Form 10-K, registration statements and prospectuses and
      amendments or supplements thereto and generally to act for and in the name
      of the undersigned with respect to such filings as fully as could the
      undersigned if then personally present and acting.

      IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
effective the 18th day of March, 1999.

                      /s/ W.R.P. White-Cooper 
                     -------------------------------
                     W.R.P. White-Cooper