Mercer offers a wide range of human resources-related consulting, investment management, and outsourcing services for companies around the world. As a consultant, the firm helps its clients design and manage retirement plans and health insurance programs of various types. Mercer's investment management business focuses on retirement plan assets. In addition, the firm offers consulting services designed to help clients get the most from their employers. As an outsourcer, Mercer administers benefits programs for its customers. The firm operates in more than 180 cities in 40 countries worldwide. Insurance giant Marsh & McLennan wholly owns the company, which was established in 1959 as William M. Mercer.