Aon Appoints Hamish Roberts as Global Power Practice Leader

Aon Corporation , the world's number one insurance broker(1) and risk adviser, has appointed Hamish Roberts as Global Practice Leader for its power business.

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

In this role, Roberts will lead the global power strategy with an immediate focus on building Aon's strength and capabilities in this industry sector for the UK and Americas regions.

"We are delighted to add a successful executive with Hamish's proven track record in the natural resources arena to our leadership team," said Steve McGill, chief executive of Aon Global and Aon Risk Services Americas. "This builds on an area of strength within our organization and will allow us to deliver even greater distinctive value to our power clients around the world."

Roberts, who has more than 20 years of experience in the insurance industry, was responsible for the successful growth of JLT's global power business over the last three years. Prior to joining JLT, he was managing director at Marsh UK, where he led their power practice group.

"Hamish has extensive experience leading successful teams and serving clients in this sector," said Rob Woods, CEO of Aon Natural Resources & Construction. "I have often admired his talents as a competitor and have seen his skills in client leadership and his ability to build, recruit and develop unmatched talent. Now I look forward to working closely with him as we continue to strengthen our power expertise."

McGill added: "Attracting Hamish to our established, talented team reinforces the significant commitment Aon is making in developing creative and innovative solutions for the power industry in keeping with our focus on delivering distinctive client value."

Roberts will be based in London and will join Aon once he has fulfilled his contractual obligations to JLT.

For more information contact: James White +44 20 7086 7201 james.white@aon.co.uk About Aon

Aon Corporation , ranked by A.M. Best as the number one global insurance brokerage based on brokerage revenues and voted best insurance intermediary, best reinsurance intermediary and best employee benefits consulting firm by the readers of Business Insurance, 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.

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.

Aon Limited is authorised and regulated by the Financial Services Authority in respect of insurance mediation activities only.

(1) Ranked by A.M. Best as the number one global insurance brokerage

based on brokerage revenues