Aon Corporation To Present At The William Blair Annual Conference

Aon Corporation announced June 24 that Patrick G. Ryan, chairman and CEO of Aon

Corporation will make a presentation at the 22nd Annual William Blair

Growth Stock Conference on Wednesday, June 26, 2002 from 9:10 a.m. to

9:40 a.m. (CDT). A live audio webcast of the presentation may be accessed by

logging onto www.twst.com/econf/mm/blair/aoc.html.

Aon Corporation (www.aon.com) is a holding company that is

comprised of a family of insurance brokerage, consulting and insurance

underwriting subsidiaries.