Mercer is an American consulting firm founded in 1945. It is one of the four operating subsidiaries of global professional services firm Marsh McLennan (NYSE: MMC). Mercer is headquartered in New York City with offices in 43 countries and operations in 130 countries. The company primarily provides human resources and financial services consulting services to its clients. Mercer has several distinct lines of business, namely: health and benefits, investments and retirement, workforce and careers, and M&A advisory services. It is the world's largest investment advisory with over US15 trillion under advisement in total. William Manson Mercer founded William M. Mercer, Limited in Vancouver, Canada in 1945. It was acquired by Marsh McLennan and merged into their employee benefits department in 1959. Mercer Consulting Group In 1975, Marsh McLennan converted their benefits operations into a wholly owned subsidiary, William M. Mercer, Inc. In 1992, a holding company was created for Marsh McLennan's three global consulting businesses, known as Mercer Consulting Group. William M. Mercer, Inc. continued to provide actuarial and employee benefits consulting within the group alongside two sister companies: Mercer Management Consulting and National Economic Research Associates, Inc, which provided corporate strategy consulting and economic consulting, respectively. In 2000, Mercer Consulting Group acquired Delta Consulting Group for its organizational development and change management expertise. Founded by organizational theorist David A. Nadler in 1980, Delta Consulting Group worked to structure effective executive teams. The firm had an influential client list, including corporations such as 3M, Citicorp, Procter & Gamble, The New York Times, and Xerox. The new entity was renamed Mercer Delta Consulting, and maintained its specialty in leadership and organizational change. The group grew through further acquisitions of Canadian Johnston Smith International, French Change Management Consultants, Spanish c.