CHICAGO, April 1, 2008 /PRNewswire-FirstCall/ -- Aon Consulting Worldwide, the global human capital consulting organization of Aon Corporation (NYSE: AOC), announced today the appointment of Reiji Ohtaki as chief executive officer for Aon Consulting Japan.

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

Ohtaki, 55, brings more than 25 years of experience in the human capital industry to Aon Consulting. As CEO, he will be responsible for leading Aon Consulting Japan's business in benefits, rewards and the broader human resources area. Ohtaki comes to Aon Consulting from Hay Group, where he led Hay's Asia business since 2005. Prior to Hay, Ohtaki worked at Mercer, where he held various senior management positions for more than 15 years, including as CEO for Mercer Japan and regional leader for Mercer's business in Asia.

"Reiji is a superb addition to the Aon Consulting Asia Pacific team. With his impressive experience in the human capital industry both in Japan and across the Asia Pacific region, Reiji will be a tremendous asset in the growth and development of services for our clients in Japan," said Edouard Merette, chief executive officer of Aon Consulting Asia Pacific.

"We are looking forward to having Reiji lead initiatives for Aon Consulting in Japan. I am confident he will bring innovative solutions and deliver distinctive value to our clients in this important economy," said Andrew Appel, chairman of Aon Consulting Worldwide. "Reiji's arrival also is another testament to Aon's commitment to building a team of unmatched talent."

Ohtaki earned a doctorate and a master's degree in electrical engineering from the University of California in San Diego, in the U.S., and a bachelor's degree from Tohoku University in Japan.

Ohtaki will be based in Tokyo and he will begin serving in his new role April 1, 2008.

About Aon

Aon Corporation (NYSE: AOC) is the leading global provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. Through its 43,000 professionals 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 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/.

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.

   For more information, contact:
   Mollie Wee
   (65) 6239 7679
   Mollie_wee@aon-asia.com

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SOURCE: Aon Corporation

CONTACT: Mollie Wee of Aon Corporation, (65) 6239 7679,
Mollie_wee@aon-asia.com

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