Sanford Robertson has served as a director since September 1998. Mr. Robertson is a general partner of Francisco Partners, a technology investment fund. He is the founder and former chairman of Robertson, Stephens & Company, an investment banking firm. Mr. Robertson is also the founder of Robertson, Colman, Siebel & Weisel, later renamed Montgomery Securities. He is also a former director of AIM Management Group Inc. (now AMVESCAP) and BankAmerica Corporation. Mr. Robertson received his BBA and MBA degrees with distinction from the University of Michigan.