AOC Aon Corp.

Strengthens Leadership Team of World's Largest Reinsurance Intermediary CHICAGO, Aug. 6 /PRNewswire-FirstCall/ -- Aon Corporation (NYSE:AOC), ranked by A.M. Best as the number one global insurance brokerage based on brokerage revenues, today announced the appointments of Michael D. O'Halleran as executive chairman of Aon Re Global (ARG), and Ted T. Devine as chief executive officer of ARG. Aon Re Global is the world's number one choice for reinsurance advice and brokerage services, and integrated capital solutions. (Logo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO ) O'Halleran, a 21-year Aon veteran, will shift from his dual role as chairman and chief executive officer of Aon Re Global to focus on the duties of executive chairman of ARG, where he will continue to provide distinguished client leadership by working with colleagues across the business to create new and innovative ways to serve clients. "Mike's leadership with clients and dedication to making Aon Re Global the destination of choice for the industry's most talented professionals has been essential to the success of ARG," said Greg Case, chief executive officer of Aon Corporation. "As executive chairman of ARG, he will continue to play a central role in further defining the division's global footprint by working closely with colleagues worldwide to serve clients, drive revenue and strengthen relationships with markets." "Mike has been a pioneer for Aon and for the industry as a whole," said Aon Executive Chairman Patrick G. Ryan. "His achievements in building ARG from a promising vision we shared into the world's number one reinsurance broker are truly amazing. The combined leadership team of Mike, with his industry experience and deep expertise, and Ted, who has demonstrated tremendous ability to drive innovation and organic growth, will further strengthen our ability to deliver distinctive value to reinsurance clients every day." Devine, who joined Aon in May 2005, served as chief operating officer of Aon Risk Services Americas (ARSA) and head of global strategy where he worked closely with the ARSA leadership team. Prior to joining Aon, Devine served as senior partner and director at McKinsey & Company, where he was a leader of its North American Insurance Practice and North American Insurance Operations and Technology efforts. In these roles, he worked extensively with insurance carriers to create and execute profit and loss management strategies, and led in-depth data analysis that resulted in the development of unique intellectual capital and client-facing content. "We have the best reinsurance organization in the world, with extraordinary leaders," said Case. "These changes underscore our commitment and excitement toward building this critical business. Given that he is an insurance industry insider who has worked with nearly every major insurance CEO, and that he has a proven track record of driving growth and teamwork inside Aon, having Ted work with Mike and the ARG team is compelling," said Case. About Aon Re Global Aon Re Global, the world's leading reinsurance intermediary, provides clients with a full range of services in the design, structure and implementation of risk-transfer programs through a network of offices in more than 40 countries. In addition to traditional treaty and facultative placement services, Aon Re Global offers clients a range of advisory and consulting services - such as catastrophe information forecasting and financial analysis. Aon Re Global, was named best reinsurance broker in 2006 by readers of Business Insurance and Reinsurance and in 2007 by readers of US Insurer. 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. For more information, contact: Rahsaan Johnson, , 312.381.2684, or David Prosperi 312.381.2485. 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 successfully execute strategic options for our Combined Insurance subsidiary, the impact of current, pending and future regulatory and legislative actions that affect our ability to market and sell, and be reimbursed at current levels for, our Sterling subsidiary's Medicare Advantage health plans, 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. http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO http://photoarchive.ap.org/ DATASOURCE: Aon Corporation CONTACT: Rahsaan Johnson, +1-312-381-2684, , or David Prosperi, +1-312-381-2485, both of Aon Corporation Web site: http://www.aon.com/

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