Aon Hewitt (formerly known as Hewitt Associates) is a provider of human capital and management consulting services headquartered in the United States in Lincolnshire, Illinois. From 500 offices in 120 countries, it provided consulting, outsourcing, and reinsurance brokerage services. The “Aon Hewitt” brand and legal entities have now been absorbed into the “Aon” business, leaving “Hewitt” as a name, obsolete.