Marsh McLennan (NYSE: MMC) is a global professional services firm headquartered in New York City, operating in insurance brokerage, risk management, reinsurance, talent and health consulting, investment advisory and management consulting. Founded in 1871, it operates through four businesses: Marsh (insurance broking and risk management), Guy Carpenter (reinsurance), Mercer (health, wealth and career consulting) and Oliver Wyman (management consulting). The firm serves clients in more than 130 countries and employs roughly 95,000 people worldwide.