AOC Aon Corp.

Johan DeKeyzer to lead health and benefits efforts IRVINE, Calif., March 22 /PRNewswire-FirstCall/ -- Aon Consulting, the human capital consulting organization of Aon Corporation (NYSE:AOC), announced today that Johan DeKeyzer has joined its Health and Benefits practice as senior vice president and west cluster practice leader. He has also assumed the role of local practice leader for the Irvine office. (Logo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO ) DeKeyzer brings more than 20 years of strategic consulting and management experience to Aon Consulting. He comes to Aon from Hewitt Associates (NYSE:HEW) where he was the health and welfare market leader for the West region. In his new role, DeKeyzer will be responsible for strategic consulting to many large employers on all aspects of health and welfare programs, and will provide leadership and operational oversight for Aon Consulting's West Coast offices, including Seattle, Portland, San Francisco, Los Angeles and Irvine. About Aon Aon Corporation (http://www.aon.com/) is a leading provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. There are 43,000 employees working in Aon's 500 offices in more than 120 countries. Backed by broad resources, industry knowledge and technical expertise, Aon professionals help a wide range of clients develop effective risk management and workforce productivity solutions. Aon Consulting Worldwide (http://www.aon.com/hcc) is among the top global human capital consulting firms, with 2006 revenues of $1.282 billion and 6,500 professionals in 117 offices worldwide. Aon Consulting is reshaping the workplace of the future through benefits, talent management and rewards strategies and solutions. In August 2006, Aon Consulting was named the best employee benefit consulting firm by the readers of Business Insurance magazine. This press release contains certain statements related to future results, or states our intentions, beliefs and expectations or predictions for the future which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results depending on a variety of factors. Potential factors that could impact results include: general economic conditions in different countries in which we do business around the world, changes in global equity and fixed income markets that could affect the return on invested assets, fluctuations in exchange and interest rates that could influence revenue and expense, rating agency actions that could affect our ability to borrow funds, funding of our various pension plans, changes in the competitive environment, our ability to implement restructuring initiatives and other initiatives intended to yield cost savings, our ability to execute the stock repurchase program, our ability to obtain regulatory or legislative changes to permit continuous sales of our supplemental Medicare health product, changes in commercial property and casualty markets and commercial premium rates that could impact revenues, changes in revenues and earnings due to the elimination of contingent commissions, other uncertainties surrounding a new compensation model, the impact of investigations brought by state attorneys general, state insurance regulators, federal prosecutors, and federal regulators, the impact of class actions and individual lawsuits including client class actions, securities class actions, derivative actions, ERISA class actions, the impact of the analysis of practices relating to stock options, the cost of resolution of other contingent liabilities and loss contingencies, and the difference in ultimate paid claims in our underwriting companies from actuarial estimates. Further information concerning the Company and its business, including factors that potentially could materially affect the Company's financial results, is contained in the Company's filings with the Securities and Exchange Commission. Media contact: Raphaele Schnoll, 312.755.3592, http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGODATASOURCE: Aon Corporation CONTACT: Raphaele Schnoll of Aon Corporation, +1-312-755-3592, Web site: http://www.aon.com/ http://www.aon.com/hcc

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