Aon today named Michael D. Rice chairman, Aon Risk Services Americas and Steve McGill chief executive officer, Aon Risk Services Americas.

(Logo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO )

Rice, a 40-year veteran of Aon and its predecessor Ryan Insurance Group, shifts from his dual role as chairman and chief executive officer of Aon Risk Services Americas to focus on the duties of chairman. In addition to supporting McGill in this role, Rice will also concentrate on building Aon's leadership position in global affinity insurance services.

"Mike's devoted leadership has been a tremendous asset to Aon Risk Services Americas. In his role as chairman, he will support our overall operation, but will specially dedicate his attention to building Aon's Global Affinity and Automotive Insurance Services (AIS) business units," said Greg Case, chief executive officer, Aon Corporation.

"This is the next chapter of what has been a distinguished and admired career for Mike. He was the sixth employee at Ryan Insurance Group, and has been a tremendous resource not only for Aon, but for me personally as well," said Aon Executive Chairman Patrick G. Ryan. "He is one of our pioneers, and has been instrumental in helping build Aon into an industry-leading, global insurance broker and risk consultant, and Fortune 250 company."

Steve McGill will assume the role of chief executive officer of Aon Risk Services Americas, in addition to his role as chief executive officer of Aon's Global Large Corporate business.

Steve is an industry leader, having had more than 28 years experience in the insurance brokerage industry. Prior to joining Aon, in May 2005, Steve served as chief executive officer of Jardine Lloyd Thompson Group Plc, the world's sixth largest broker.

"Steve is an industry veteran with a great deal of energy and a can-do attitude. Since joining Aon, Steve has made a significant and immediate impact in fast developing our Global Large Corporate business. His absolute focus on client and broking leadership has been exceptional and can now additionally extend into our Americas business, which also represents a significant proportion of the Global Large Corporate client base," said Case. "I am delighted Steve has agreed to take on this additional role."

Steve will be based in Chicago. Rice and McGill assume their new positions today.

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 47,000 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:
  Al Orendorff, Aon Corporation, 312.381.3153, Al_Orendorff@aon.com
  or
  Thaddeus Woosley, Aon Corporation, 312.381.2446, Thaddeus_Woosley@aon.com

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 implement 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.

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SOURCE: Aon Corporation

CONTACT: Al Orendorff, +1-312-381-3153, Al_Orendorff@aon.com , or
Thaddeus Woosley, +1-312-381-2446, Thaddeus_Woosley@aon.com , both of Aon
Corporation

Web site: http://www.aon.com/