Mr. Roberts has served as the Managing Director of Reliant Equity Investors, L.L.C., Chicago, Illinois (private equity firm) since September 2000. In April 2000, he retired from General Motors Corporation, Detroit, Michigan (manufacturer of motor vehicles), where he was Group Vice President, North American Vehicle Sales, Service and Marketing, a position he had held since July 1999. Mr. Roberts is also a Director of Abbott Laboratories.