Marsh & McLennan Companies, Inc., also called Marsh & McLennan, is a professional services firm, which offers clients advice and solutions in risk, strategy and people. It operates through the following business segments: Risk & Insurance Services, and Consulting. Read More The Risk and Insurance Services segment includes risk management activities, as well as insurance and reinsurance broking and services. The Company conducts business in this segment through Marsh and Guy Carpenter. The Consulting segment includes health, wealth & career services & products, specialized management, economic and brand consulting services. The firm conducts business in this segment through Mercer and Oliver Wyman Group. Marsh & McLennan Cos was founded by Henry W. Marsh and Donald R. McLennan in 1871 and is headquartered in New York, NY.