Aon Hewitt is a world's largest human capital and management consulting solution company. It is flagship company of the Aon PLC. The company provides human resources services, risk management services, outsourcing services, insurance and reinsurance brokerage services in across the world. Aon provides these services to the its customers through more than 500 branch offices in approximately 120 nations in around the world, with over 65,000 employees. It was established in the year of 1940 as Edwin Shields Hewitt and Associates, global headquarters is located in Lincolnshire, Illinois, United States. The postal and official address, email address and phone number (helpline) of Aon Hewitt service center is given above. The helpline of Aon Hewitt service center may or may not be toll free.