MARSH NAMES GREG ARMS AS GLOBAL HEAD
OF EMPLOYEE BENEFITS PRACTICE

New York, June 25, 2008 —Marsh, the world's leading insurance broker and risk advisor, today announced it has appointed Greg Arms as global head of the firm's Employee Benefits Practice.

Mr. Arms, who will be based at Marsh's world headquarters in New York, will be responsible for leading the firm's employee benefits business around the world. He will report jointly to Joseph McSweeny, president, U.S./Canada, and Alexander Moczarski, president, International.

In the United States, Mr. Arms will work to expand the collaboration that exists between Marsh and Mercer, a leading provider of consulting, outsourcing and investment solutions in the human resources and financial areas. Both Marsh and Mercer are subsidiaries of Marsh & McLennan Companies, Inc. (MMC). He also will focus on specific segments, such as small businesses, where Marsh provides employee benefit brokerage services and can deliver the intellectual capital and solutions of Mercer's Health & Benefits business on behalf of clients.

Outside the U.S., Mr. Arms will work closely with Marsh's country and regional leaders throughout the world to enhance joint Marsh-Mercer operations, as well as employee benefits activities in countries where Marsh is the sole MMC provider of employee benefits services.

During his 30-year career, Mr. Arms has demonstrated proven leadership in the insurance sector both in the United States and globally. Most recently, he was chairman and CEO of Willis Group Holdings' Global Employee Benefits Practice, where he established a new global business division from previously independent, domestic and international units. Earlier, he was chief marketing officer and International CEO of UnitedHealth Group, responsible for developing that firm's international business strategy.

Beginning in 1980, Mr. Arms spent 24 years at American International Group, Inc., where he held a number of leadership positions, including president & worldwide director, Group Management Division, as well as management positions in Paris, Cyprus, and Saudi Arabia. A graduate of Colgate University, Mr. Arms began his career in 1978 at the Travelers Insurance Company.

Marsh has 26,000 employees and provides advice and transactional capabilities to clients in over 100 countries. Marsh is a unit of Marsh & McLennan Companies (MMC), a global professional services firm with more than 55,000 employees and annual revenue exceeding $11 billion. MMC also is the parent company of Guy Carpenter, the risk and reinsurance specialist; Mercer, the provider of HR and related financial advice and services; Oliver Wyman, the management consultancy; and Kroll, the risk consulting firm. MMC's stock (ticker symbol: MMC) is listed on the New York, Chicago and London stock exchanges. MMC's Web Site is www.mmc.com.

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