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William M. Mercer, Incorporated is one of the nation's leading human resource consulting organizations. Headquartered in New York and with offices in more than 40 US cities, the firm is the US operating company of William M. Mercer Companies LLC, a worldwide consulting organization with more than 13,000 employees serving clients in 136 cities in 40 countries and territories. The company is part of Mercer Consulting Group, Inc., a wholly owned subsidiary of Marsh & McLennan Companies, Inc. (MMC), which is listed on the New York, Chicago, Pacific, and London stock exchanges.