Marsh & Mclennan Companies is a professional services firm based out of New York, New York. The firm operates through its four companies, namely, Marsh, Guy Carpenter, Mercer and Oliver Wyman. Marsh provides risk management, risk consulting, insurance broking, alternative risk financing, and insurance program management services to businesses, government entities, organizations, and individuals. Guy Carpenter offers services related to reinsurance broking expertise, strategic advisory services and industry-leading analytics. Mercer is a global consulting firm in talent, health, retirement, and investments. Oliver Wyman specializes in strategy, operations, risk management, and organizations transformation. The firm was established in 1871.