AOC Aon Corp.

Industry Veteran, Energy Expert, Joins Aon After Senior Leadership Roles With Willis and Marsh CHICAGO, May 30 /PRNewswire-FirstCall/ -- Aon today announces the appointment of Alexander W. (Sandy) Vietor as executive vice president of Aon Risk Services Americas (ARSA). (Logo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO ) Prior to joining Aon, Vietor held several senior leadership positions with both Willis and Marsh, having served most recently as executive vice president of Willis North America. Vietor joined Willis in 1991 as president and chief executive officer of the company's North American Energy operations, and was named chairman of Willis Global Energy in 1995. Before joining Willis, Vietor spent 16 years with Marsh Marine & Energy. Said Greg Case, president and chief executive officer, Aon Corporation: "As a professional services organization, talent is our greatest asset. It is exciting to welcome an individual of Sandy's caliber to our organization. He is one of the most accomplished and respected professionals in our industry, and brings an unquestioned dedication to client service; Sandy's arrival is evidence of our continued commitment to investing in Aon's energy capabilities. I am confident that his leadership will be instrumental in driving Aon forward." At Aon, Vietor will assist in shaping the overall ARSA strategy while providing important client service and broking expertise to Aon's major Global Large Corporate (GLC) accounts, particularly in the energy sector. Furthermore, Sandy's unique experience in the energy sector will enable him to play a key role in strengthenind GLC Chief Executive Officer Steve McGill, and will join the ARSA Executive Committee and the GLC Board. He is based in New York. Said McGill: "Sandy's experience with global large clients is truly world class. He has been influential in the design and implementation of some of the industry's most complex risk management programs and oversaw the collection of the largest single client claim ever suffered in the energy market. His innovative, problem-solving approach to client service makes him an ideal addition to our talented team of senior executives." Vietor earned a bachelor's degree in civil engineering from Tufts University in 1972 and a master's in business administration from New York University Business School in 1975. About Aon Aon Corporation (NYSE:AOC) ( 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 46,000 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. For more information, contact: Thaddeus Woosley, Aon Corporation, 312.381.2446, 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, 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, and ERISA class actions, 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. http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO http://photoarchive.ap.org/ DATASOURCE: Aon Corporation CONTACT: Thaddeus Woosley of Aon Corporation, +1-312-381-2446, Web site: http://www.aon.com/

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