CHICAGO, July 15 /PRNewswire-FirstCall/ -- Aon Consulting Worldwide, the global human capital consulting organization of Aon Corporation (NYSE: AOC), today announced it has become a signatory to the United Nations Principles for Responsible Investment (PRI).

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The PRI is designed to help investors consider the environmental, social and governance (ESG) issues in investment decision-making and ownership practices, thereby improving the long-term returns to beneficiaries. Becoming a signatory formalizes Aon's Investment Consulting group's use of the PRI framework in determining investment risks in a company, security, or mutual fund on behalf of clients worldwide.

"There is increasing evidence that ESG issues can be material to the long-term performance of portfolios," said Angie Parrish, Aon Investment Consulting practice leader. "By becoming a signatory, Aon's Investment Consulting group reaffirms our commitment to client demands for sound, long-term investment returns that appropriately value the risks and opportunities of ESG factors."

Aon's Investment Consulting group considers corporate governance, environmental and legal risks in researching investment opportunities of a company, security, or mutual fund. For more information on this and other measures taken by Aon Consulting to support the UN Principles of Responsible Investment, please send an email to responsibleinvestment@aon.com.au.

About Aon Consulting

Aon Consulting Worldwide (http://www.aon.com/hcc) is among the top global human capital consulting firms, with 2007 revenues of $1.352 billion and 6,335 professionals in 117 offices worldwide. Aon Consulting is shaping the workplace of the future through benefits, talent management and rewards strategies and solutions. Aon Consulting was named the best employee benefit consulting firm by the readers of Business Insurance magazine in 2006 and 2007.

About Aon

Aon Corporation (NYSE: AOC) is the leading global provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting. Through its 36,000 colleagues worldwide, Aon readily delivers distinctive client value via innovative and effective risk management and workforce productivity solutions. Our industry-leading global resources, technical expertise and industry knowledge are delivered locally through more than 500 offices in more than 120 countries. Aon was named the world's "best broker" by Euromoney magazine's 2008 Insurance Survey. Aon also was ranked by A.M. Best as the number one global insurance brokerage in 2007 based on brokerage revenues, and voted best insurance intermediary, best reinsurance intermediary, and best employee benefits consulting firm in 2007 by the readers of Business Insurance. For more information on Aon, log onto http://www.aon.com/.

   For more information, contact:
   Joe Micucci
   312-381-4786
   joe_micucci@aon.com

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SOURCE: Aon Corporation

CONTACT: Joe Micucci of Aon Corporation, +1-312-381-4786,
joe_micucci@aon.com

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