He will be joining in mid July 2009 from NCR Corporation where he currently serves as senior vice president, general counsel and secretary.
"I'm excited to join Aon. This is an opportunity for me to be part of a great firm and to work with an extremely talented and motivated group of business leaders. I look forward to the challenge of leading a global legal team and helping Aon achieve its business objectives," says Lieb.
Lieb joined NCR in 2006 where he managed an international law department and provided counsel to the board of directors and senior executives on all legal matters.
Prior to that, he served as senior vice president, general counsel and corporate secretary for Symbol Technologies.
Lieb's career highlights also include serving as a partner at Jones Day Reavis & Pogue (now Jones Day), a prosecutor for the United States Attorney's Office in the Southern District of New York; an adjunct professor at Fordham Law School and as a law clerk for US Supreme Court Chief Justice Warren Burger.