Exhibit 31.1
CERTIFICATIONS
I, Daniel S. Glaser, certify that:
1. I have reviewed this Amendment No. 1 to the quarterly report on Form 10-Q/A of Marsh & McLennan Companies, Inc. (the “registrant”); and
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.
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| Date: | May 9, 2013 | | /s/ Daniel S. Glaser |
| | | | Daniel S. Glaser |
| | | | President and Chief Executive Officer |
