EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren his true and lawful attorney-in-fact and agent, for
him, and in his name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ ROBERT E. GALLAGHER
                                            ----------------------------
                                            Robert E. Gallagher




                                                                    EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren his true and lawful attorney-in-fact and agent, for
him, and in his name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ JAMES J. BRANIFF III
                                            ----------------------------
                                            James J. Braniff III






                                                                    EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren his true and lawful attorney-in-fact and agent, for
him, and in his name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ T. KIMBALL BROOKER
                                            ----------------------------
                                            T. Kimball Brooker




                                                                    EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren his true and lawful attorney-in-fact and agent, for
him, and in his name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ GARY P. COUGHLAN
                                            ----------------------------
                                            Gary P. Coughlan



                                                                    EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren his true and lawful attorney-in-fact and agent, for
him, and in his name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ JAMES W. DURKIN, JR.
                                            ----------------------------
                                            James W. Durkin, Jr.







                                                                    EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren her true and lawful attorney-in-fact and agent, for
her, and in her name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ ILENE S. GORDON
                                            ----------------------------
                                            Ilene S. Gordon




                                                                    EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren his true and lawful attorney-in-fact and agent, for
him, and in his name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ ELBERT O. HAND
                                            ----------------------------
                                            Elbert O. Hand





                                                                    EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren his true and lawful attorney-in-fact and agent, for
him, and in his name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ DAVID E. McGURN, JR.
                                            ----------------------------
                                            David E. McGurn, Jr.





                                                                    EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren his true and lawful attorney-in-fact and agent, for
him, and in his name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ RICHARD J. McKENNA
                                            ----------------------------
                                            Richard J. McKenna



                                                                    EXHIBIT 24.0

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints John C. Rosengren his true and lawful attorney-in-fact and agent, for
him, and in his name, place and stead, in any and all capacities (i) to sign the
Arthur J. Gallagher & Co. Annual Report on Form 10-K for the fiscal year ending
December 31, 2002 and any and all amendments thereto and (ii) to file the same,
with all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in-fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in such connection, as fully to all intents
and purposes as the undersigned might or could do in person, hereby ratifying
and confirming all that said attorney-in-fact and agent, may lawfully do or
cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned has duly executed this instrument as of
this 20th day of March, 2003.


                                            /s/ JAMES R. WIMMER
                                            ----------------------------
                                            James R. Wimmer