John “Jack” T. Sinnott, vice chairman, office of the chief executive officer, plans to retire, effective Dec. 31, according to the New York-based professional services company Marsh & McLennan Companies Inc.

Mr. Sinnott joined MMC’s predecessor company, Marsh & McLennan Inc., in 1963, and held various executive positions with the company including vice chairman and CEO of J&H Marsh & McLennan Inc. and president and chief executive office of Marsh & McLennan Inc.

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