Marsh & McLennan Companies is a global professional services firm headquartered in New York City. It provides a range of services including risk management, insurance brokerage, and consulting through its various subsidiaries, such as Marsh, Guy Carpenter, Mercer, and Oliver Wyman. Founded in 1905, the company operates in over 130 countries and employs thousands of professionals. Its primary focus is to help clients manage risks and improve their performance through strategic advice and innovative solutions. Marsh & McLennan is recognized as a leader in the insurance and consulting industries.