Patterson-UTI Energy Inc.

Mr. Wall has served as President and Chief Executive Officer of Patterson-UTI since October 1, 2007. From April through September 2007 he served as Chief Operating Officer of Patterson-UTI. From 2005 to April 2007, Mr. Wall served as Group President, Completion and Production of Baker Hughes Incorporated, an oilfield service company. In that capacity, Mr. Wall was responsible for the combined activities of Baker Oil Tools, Baker Petrolite, Centrilift and ProductionQuest divisions. From 2003 to 2005 he served as President of Baker Oil Tools, a division of Baker Hughes, and from 1997 to 2003 he served as President of Hughes Christensen Company, a division of Baker Hughes. Mr. Wall holds a Bachelor Degree in Economics from the University of Calgary and a Masters of Business Administration in Finance and Marketing from the University of Alberta.

Mr. Pipkin has served as Chief Accounting Officer and Assistant Secretary of Patterson-UTI since August 2007. From June 2006 to August 2007, Mr. Pipkin served as Director of Financial Reporting of Patterson-UTI. From April 2001 through May 2006, Mr. Pipkin was Controller and Vice President of Accounting and Reporting for Alamosa Holdings, Inc., a publicly traded wireless telecommunications company. Prior to April 2001, Mr. Pipkin was in the practice of public accounting. Mr. Pipkin is a Certified Public Accountant and holds a Bachelor of Business Administration in Accounting from Texas Tech University.

Mr. Vollmer has served as Chief Financial Officer and Treasurer of Patterson-UTI since November 2005 and Senior Vice President — Corporate Development of Patterson-UTI since May 2001. Mr. Vollmer also served as Secretary of Patterson-UTI from November 2005 to February 2007. Mr. Vollmer served as Senior Vice President, Chief Financial Officer, Secretary and Treasurer of UTI from 1998 to May 2001. From 1992 until 1997, Mr. Vollmer served in a variety of capacities at Blockbuster Entertainment, including Senior Vice President — Finance and Chief Financial Officer of Blockbuster Entertainment’s Music Division. Mr. Vollmer holds a Bachelor of Arts in Accounting from Michigan State University.

Mr. Berns has served as Senior Vice President of Patterson-UTI since April 2003 and as a director of Patterson-UTI since May 2001. Mr. Berns served as a director of UTI from 1995 to May 2001. Mr. Berns has been an executive with REMY Investors since 1994. Mr. Berns holds a Bachelors Degree in Business Administration from San Diego State University and a Masters Degree in Taxation from Golden Gate University.

Mr. Moll has served as General Counsel and Secretary of Patterson-UTI since February 2007. From July 2006 to February 2007, Mr. Moll served as Vice President and Counsel of Stewart & Stevenson LLC, an oilfield equipment manufacturing company. From January 1996 to July 2006, Mr. Moll served in a variety of capacities in the legal department of Stewart & Stevenson Services, Inc., an equipment manufacturing company, including Deputy General Counsel from March 2005 to July 2006 and Managing Attorney from September 2001 to March 2005. From September 1991 to January 1996, Mr. Moll was an associate with the law firm of Andrews & Kurth LLP. Mr. Moll holds a Bachelor of Business Administration in Accounting from the University of Texas and a J.D. from the University of Houston Law Center.

Mr. Siegel has served as Chairman of the Board and as a director of Patterson-UTI since May 2001. Mr. Siegel served as Chairman of the Board and as a director of UTI Energy Corp. (“UTI”) from 1995 to May 2001, when UTI merged with and into Patterson-UTI. Mr. Siegel has been President of REMY Investors & Consultants, Incorporated (“REMY Investors”) since 1993. From 1992 to 1993, Mr. Siegel was President, Music Division, Blockbuster Entertainment Corp. From 1988 through 1992, Mr. Siegel was an Executive Vice President of Shamrock Holdings, Inc., a private investment company, and Managing Director of Shamrock Capital Advisors, Incorporated. Mr. Siegel holds a Bachelor of Arts degree from Colgate University and a J.D. from the University of California, Berkeley (Boalt Hall) School of Law.

Mr. Talbott has served as a director of Patterson-UTI since its incorporation in 1978. Mr. Talbott co-founded Patterson-UTI and has served in various capacities, including as its Chief Executive Officer from 1983 until his retirement from that position on September 30, 2007. He also served as Chairman of the Board from 1983 to May 2001. Mr. Talbott is currently employed as a consultant by Patterson-UTI. Mr. Talbott holds a Bachelor of Science degree in petroleum engineering from Texas Tech University.

Mr. Peak has been Chairman, CEO, and CFO of Contango since its formation in September 1999. Mr. Peak entered the energy industry in 1972 as a commercial banker and held a variety of financial and executive positions in the oil and gas industry prior to starting Contango in 1999. Mr. Peak served as an officer in the U.S. Navy from 1968 to 1971. Mr. Peak received a BS in physics from Ohio University in 1967, and an MBA from Columbia University in 1972. He currently serves as a director of Patterson-UTI Energy, Inc., a provider of onshore contract drilling services to exploration and production companies in North America.

Mr. Hunt has served as a director of Patterson-UTI since April 2003 and served as a director of UTI from 1994 to May 2001. Mr. Hunt is an energy consultant and investor. Mr. Hunt served as Senior Vice President — Strategic Planning of PPL Corporation, an international energy and utility holding company, from 1998 to 2000. Mr. Hunt served as the President and Chief Executive Officer of Penn Fuel Gas, Inc., a natural gas and propane distribution company, from 1992 to 1999. Previously, Mr. Hunt was President and Chairman of Carnegie Natural Gas Company, a gas distribution and transmission company, and of Apollo Gas Company, a natural gas distributor. Mr. Hunt holds a Bachelor of Engineering degree from the University of Saskatchewan, Canada and a Masters of Business Administration from Southern Methodist University.