People: Patterson-UTI Energy Inc (PTEN.O)

Mr. Mark S. Siegel has served as Chairman of the Board and as a Director of Patterson-UTI Energy, Inc., 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 of Blockbuster Entertainment Corp.’s Music Division. 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.