Aon Consulting today announces the creation of a global Financial Advisory and Litigation Consulting Services practice. The company also announces the hiring of veteran forensic accounting and litigation consulting experts Roger Siefert and Jerry Barbanel, who join Aon Consulting as executive vice presidents and co-global practice leaders in charge of the Financial Advisory and Litigation Consulting Services practice.

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Said Aon Consulting Chief Executive Officer Andrew Appel: "The Financial Advisory and Litigation Services practice strengthens our portfolio and complements the employee benefit and ERISA consulting services we already offer clients. Given the regulatory environment of today's business world, we believe providing these distinctive client services will be welcome in the marketplace. Roger and Jerry are two of the leading experts in financial advisory and litigation consulting, and we are pleased they have chosen to join Aon Consulting."

The Financial Advisory and Litigation Consulting Services practice will provide a full suite of consulting services including: white-collar and financial statement investigations; securities litigation; financial due diligence; damage calculations; Sarbanes-Oxley consulting; financial valuation services; expert testimony; computer forensics; and other related specialties.

According to Greg Case, chief executive officer, Aon Corporation: "Roger and Jerry are two of the most respected experts in their field. The fact they chose to join Aon not only demonstrates our commitment to attracting the industry's top talent, but reconfirms that the industry's best want to work at Aon."

Roger Siefert has more than 20 years of combined experience in forensic accounting, litigation consulting, financial advisory, accounting and auditing services. During his career he has assisted numerous clients in significant litigation matters and investigated financial statement fraud, as well as served as an expert witness. Roger joins Aon Consulting from Kroll, where he led its Financial Advisory Service practice. Prior to joining Kroll, Siefert was partner at Deloitte & Touche, where he held several positions during his 20-year career, including working in the Office of the General Counsel and head of the securities litigation practice in the New York Office. He is a licensed CPA.

Jerry Barbanel also joins Aon Consulting from Kroll, where he led its Forensic and Investigative Accounting practice and oversaw its High-Tech Investigations and IT Consulting practice. Jerry began his career in 1985 as a financial services auditor with Peat Marwick Mitchell & Co. Barbanel has also held positions in forensic accounting and litigation consulting at both KPMG and Arthur Andersen, where he was director and principal respectively. Prior to that Barbanel served as an Assistant District Attorney in Manhattan, and subsequently practiced civil litigation at a law firm. Barbanel currently concentrates on complex financial investigations and securities litigation, having most recently led the forensic accounting and litigation consulting efforts at Enron. Barbanel is licensed Certified Public Accountant, Certified Fraud Examiner, Certified Anti-Money Laundering Specialist and was admitted to the bars of the U.S. Supreme Court, U.S. District Court (Southern and Eastern Districts of New York), and the States of New York and New Jersey.

  Siefert and Barbanel are based in New York City.

  About Aon

Aon Corporation ( http://www.aon.com/ ) (NYSE: AOC) 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 Consulting is among the top global human resources consulting firms, with 2004 revenues of $1.247 billion and 7,000 professionals in 120 offices throughout the world. Aon Consulting delivers integrated consulting solutions to help clients with employee benefits, human resources outsourcing, compensation, communication and management consulting.

  For more information, contact:

  Joe Micucci, Aon Consulting Worldwide, 312-381-4786, Joe_Micucci@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: Joe Micucci of Aon Consulting Worldwide, +1-312-381-4786, or
Joe_Micucci@aon.com ; or Thaddeus Woosley of Aon Corporation, +1-312-381-2446,
or Thaddeus_Woosley@aon.com

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