KAR Auction Services, Inc. announced that Tom O'Brien, chief executive officer of Insurance Auto Auctions, Inc. (IAA) and a director of KAR's board, will step down as CEO of IAA effective April 30, 2014. O'Brien will remain a member of the company's board of directors until the company's next annual meeting of stockholders to be held in June 2014, at which time he will retire from the board.