Alan Krenek — Chief Financial Officer, Senior Vice President, Treasurer and Secretary at Basic Energy Services

Mr. Alan Krenek has been the Chief Financial Officer and Treasurer at Basic Energy Services, Inc. (formerly, Sierra Well Service Inc.) since January 2005 and has been its Senior Vice President and Secretary since May 2006. Mr. Krenek served as Principal Accounting Officer of Basic Energy Services Inc. Mr. Krenek served as Assistant Secretary of Digital Commerce Corp. since April 2000. He served as Vice President of Basic Energy Services, Inc. since January 2005. He has 17 years of related industry experience. From December 1999 to November 2001, he served as Vice President of finance and Chief Financial Officer of Digital Commerce Corporation. Mr. Krenek served as Controller of Digital Commerce Corp. since December 1999. He served as Vice President of Corporate Accounting & Finance at Global Telesystems Group Inc. from January 1997 to December 1999. Mr. Krenek served as Controller of Landmark Graphics Corporation from September 1995 to December 1996, where he was responsible for SEC reporting, general accounting, financial policies and procedures and purchasing functions. He served as Controller of Noble Drilling Corporation from August 1993 to July 1995. He served as Vice President and Controller of Fleetwood Retail Corp., a subsidiary in the manufactured housing division of Fleetwood Enterprises, Inc. from October 2002 to January 2005. From March 2002 to August 2002, he served as a Consultant involved in management, assessment of operational and financial internal controls, cost recovery and cash flow management. Mr. Krenek worked in various financial management positions at Pool Energy Services Co. from 1980 to 1993 and at Noble Corporation from 1993 to 1995. He graduated with a B.B.A. degree in Accounting from Texas A&M University in 1977 and is a Certified Public Accountant.