EXHIBIT 32


          Certification of Chief Executive and Chief Financial Officers
          -------------------------------------------------------------





         The certification set forth below is being submitted in connection with
the Quarterly Report on Form 10-Q for the fiscal quarter ending June 30, 2003
(the "Report") for the purpose of complying with Rule 13a-14(b) or Rule
15d-14(b) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act") and Section 1350 of Chapter 63 of Title 18 of the United States Code.

         Jeffrey W. Greenberg, the Chief Executive Officer and Sandra S.
Wijnberg, the Chief Financial Officer of Marsh & McLennan Companies, Inc. each
certifies that, to the best of his or her knowledge:

     1.   such Report fully complies with the  requirements  of Section 13(a) of
          the Securities Exchange Act of 1934; and

     2.   the  information  contained  in the  Report  fairly  presents,  in all
          material respects,  the financial  condition and results of operations
          of Marsh & McLennan Companies, Inc.


                                             /s/ Jeffrey W. Greenberg
                                             ----------------------------------
                                             Name: Jeffrey W. Greenberg
                                             Chief Executive Officer



                                             /s/ Sandra S. Wijnberg
                                             ----------------------------------
                                             Name: Sandra S. Wijnberg
                                             Chief Financial Officer