Mr. Robison has served as our Chairman, President and Chief Executive Officer since 1997. Prior to joining us, Mr. Robison was an Executive Vice President, Chief Operating Officer and a director of General Medical Corporation. Mr. Robison holds a B.B.A. from the University of Texas and an M.A. from the University of Texas-Dallas.

Mr. White has served as a director since June 2005. He has been employed by Charlesbank Capital Partners, LLC, a private equity firm, since 1998, and currently serves as a Managing Director. Prior to joining Charlesbank Capital Partners, LLC, Mr. White was employed by Harvard Private Capital Group. Mr. White holds a B.A. from Brigham Young University.

Mr. Eisenson has served as a director since June 2005. He co-founded Charlesbank Capital Partners, LLC, a private equity firm, in 1998, and currently serves as Managing Director and Chief Executive Officer. Prior to the formation of Charlesbank Capital Partners, LLC, Mr. Eisenson was the President of Harvard Private Capital Group. Mr. Eisenson is a member of the board of directors of Penske Auto Group, Inc. and Catlin Group Ltd. Mr. Eisenson holds a B.A. from Williams College and a J.D. and M.B.A. from Yale University.

Mr. Rosen has served as a director since June 2005. He co-founded Charlesbank Capital Partners, LLC, a private equity firm, in 1998, and currently serves as a Managing Director. Prior to the formation of Charlesbank Capital Partners, LLC, Mr. Rosen was a Managing Director of Harvard Private Capital Group. Mr. Rosen holds a B.A. from Amherst College and a J.D. from Yale University.

Mr. Biegler has served as a director since January 2007. Mr. Biegler has been Chairman of Estrella Energy L.P., a company engaged in natural gas transportation and processing, since September 2003. Mr. Biegler 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 previously served as Chairman, President and CEO of ENSERCH Corporation from 1993 to 1997. Mr. Biegler is also a director of Dynegy Inc., Trinity Industries, Inc., Southwest Airlines Co. and Austin Industries. Mr. Biegler holds a B.S. from St. Mary's University and completed the Harvard University Advanced Management Program.

Mr. Steinhart has served as a director since January 2007. Mr. Steinhart served as Chairman and Chief Executive Officer of the Commercial Banking Group of Bank One Corporation from December 1996 until his retirement in January 2000. From January 1995 to December 1996, Mr. Steinhart was Chairman and Chief Executive Officer of Bank One, Texas, N.A. Mr. Steinhart joined Bank One in connection with its merger with Team Bank, which he founded in 1988. Mr. Steinhart is a member of the board of directors of Penson Worldwide, Inc., Texas Industries, Inc., and Penske Auto Group, Inc. and serves as a trustee of the MFS/Compass Group of mutual funds. Mr. Steinhart also serves on the advisory boards of JP Morgan Chase Dallas and SunTx Capital Partners. Mr. Steinhart holds a B.B.A. and an M.B.A. from the University of Texas at Austin and is a Certified Public Accountant.

Mr. Pinkerton is the former Controller of TXU Corp, an energy services company, and former Vice President and Chief Accounting Officer of Enserch Corporation/Lone Star Gas Company, a diversified energy company. Prior to joining Enserch, Mr. Pinkerton served as an auditor for 26 years with Deloitte & Touche, LLP (formerly Deloitte Haskins & Sells), including 15 years as an audit partner. Mr. Pinkerton also sits on the Board of Directors of Holly Energy Partners, L.P., where he serves as the chairman of Holly's Audit Committee.

Mr. Corcoran is the former president of Fort Dodge Animal Health, a division of Wyeth. Mr. Corcoran is the immediate past Chairman of the Executive Committee and the Board of Directors of the Animal Health Institute, the trade association for animal health product manufacturers. Prior to his distinguished career in animal health, Mr. Corcoran spent 15 years in various sales, marketing and leadership roles with Diamond Shamrock Corporation. Mr. Corcoran has received lifetime achievement awards from both Animal Pharm, as well as the American Veterinary Distributor Association.