Marsh and McLennan Companies, Inc. is a professional services firm. The Company operates as two business segments: Risk and Insurance Services, and Consulting. The Risk and Insurance Services segment provides risk management activities and insurance broking, reinsurance broking and insurance program management services for businesses, public entities, insurance companies, associations, professional services organizations and private clients. The Company conducts business in this segment through Marsh and Guy Carpenter. The Company conducts business in its Consulting segment through two main business groups: Mercer, provides consulting expertise, advice, services and solutions in the areas of health, retirement, talent and investments, and Oliver Wyman Group, provides specialized management and economic and brand consulting services.