David W Biegler

Director since 1992. Chairman of the Audit Committee and a member of the Corporate Governance and Directors Nominating Committee and the Finance and Risk Management Committee. Mr. Biegler began serving during 2003 as Chairman of Estrella Energy L.P., a company engaged in the natural gas transportation and processing industry. He retired as Vice Chairman of TXU Corporation at the end of 2001, having served TXU Corporation as President and Chief Operating Officer from 1997 until 2001. Mr. Biegler is also a director of Dynegy Inc., a company engaged in power generation; Southwest Airlines, Inc., a major domestic airline; Animal Health International, a company engaged in selling and distributing animal health products; Austin Industries, Inc., a civil, commercial and industrial construction company; and Guaranty Financial Group Inc., a company conducting consumer and business banking activities and providing property, casualty, and life insurance products.