LONDON  –  28 June 2005  – Michael Reynolds has been appointed as Chief Financial Officer of Aon Re International (ARI), Aon Re UK, in addition to his current role as CFO for Aon Captive Services Group (ACSG).

Mr Reynolds will be based in London and will be responsible for the financial management and associated activity of these three business units. He will join the boards of ARI and Aon Re UK and will be a key member of the team driving the profitable growth of these businesses.

He joined Aon in 1996 and was the Financial Controller for the Aon Bermuda Broking and Captive operations until January 2001, when he was promoted to the position of CFO for Aon Captive Services Group and relocated to the Isle of Man. Prior to joining Aon, Mr Reynolds was in public practice in Ireland for eight years.

Commenting on his appointment, Clem Booth, Chairman & Chief Executive Officer, Aon Re International, said: “I am delighted that Mike Reynolds has agreed to assume the responsibilities of CFO for our international and UK reinsurance operations, as well as our captive organisation. Mike will have a key role to play in driving the growth of these businesses.”

Note to Editors:

About Aon

Aon Corporation (www.aon.com) is a leading provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. The company employs approximately 48,000 professionals in its 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 relating to future results, 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 the general economic conditions in different countries around the world, fluctuations in global equity and fixed income markets, exchange rates, rating agency actions, resolution of pending regulatory investigations and related issues, including those related to compensation arrangements with underwriters, pension funding, ultimate paid claims may be different from actuarial estimates and actuarial estimates may change over time, changes in commercial property and casualty markets and commercial premium rates, the competitive environment, the actual costs of resolution of contingent liabilities and other loss contingencies, and the heightened level of potential errors and omissions liability arising from placements of complex policies and sophisticated reinsurance arrangements in an insurance market in which insurer reserves are under pressure.  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.