Aon Corporation (NYSE: AOC) today announced that three health care risk management veterans, Tris Gabriel, Michael Zuckerman and Mary Pulley, have joined its national Healthcare practice.

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

Said Greg Morris, chief operating officer Aon Healthcare, "Tris, Michael and Mary bring five decades of health care experience in health and managed care risk management and alternative risk financing. They share a desire to make a difference in the health care industry and help clients improve medical outcomes. By continuing to add veteran leadership, Aon will continue to provide the unmatched client service and advice for which it has become known."

Tris Gabriel joins Aon Healthcare as a senior vice president. With an understanding of liability issues and 17 years of experience developing and executing insurance and other risk solutions in the managed care sector, Tris has detailed market knowledge and strong relationships with insurance carriers that enable him to effectively address the risk mitigation needs of managed care organizations. Prior to joining Aon, Tris served as national managed care practice leader for Marsh Inc.

Michael Zuckerman also joins Aon Healthcare as a senior vice president. In this role he will manage client relationships, support the practice group's alternative risk transfer consulting practice, and provide team training about alternative risk and technical health care risk management and insurance strategies. Michael has spent 18 years developing alternative risk financing vehicles. He most recently served as director, risk financing and insurance at Temple University.

Mary Pulley joins Aon Healthcare as the practice's director for the state of Indiana. As such, she will lead the company's statewide effort, manage its sponsorship of the Indiana Hospital & Health Association, work to bring new products and markets to the state, and continue to expand Aon's client base by ensuring the highest quality product, service and resources are readily available. With more than 17 years of service in health care for Marsh Inc., Mary has managed insurance programs for several large hospitals and has experience in forming captives, risk retention groups and risk purchasing groups for large channeled physician programs.

About Aon Corporation

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 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.

Aon Healthcare is dedicated to solving business, patient outcome and human capital risk issues for health care. Aon Healthcare coordinates services of its national, regional and local expertise as a seamless team. Comprehensive expertise includes medical professional, managed care, captives, claims and risk control, benefits design and management, compensation consulting, HR, financial risk management, Return on Risk strategies, and change management.

   Contact:  Amy Littleton, KemperLesnik
             312.755.3572, amy.littleton@kemperlesnik.com

             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, 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 regulatory investigations brought by state attorney generals and state insurance regulators related to our compensation arrangements with underwriters and related issues, 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: Amy Littleton, of KemperLesnik, +1-312-755-3572,
amy.littleton@kemperlesnik.com , or Thaddeus Woosley, of Aon Corporation,
+1-312-381-2446, thaddeus_woosley@aon.com

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