Michael J. Doss, Chief Executive Officer

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Michael J. Doss has served as our Chief Executive Officer since October 2015. He joined our Company in January 2014 as Senior Vice President—Finance and Treasurer and was named Chief Financial Officer in December 2014. From July 2008 until joining our Company, Mr. Doss served as Vice President of Finance of Energy Transfer Partners, L.P., or ETP, a master limited partnership that owns and operates a portfolio of energy assets in the United States and then as Vice President of Strategic Planning for its affiliate Energy Transfer Equity, L.P. Prior to ETP, he was a Senior Credit Officer at Moody’s Investors Service, a provider of credit ratings, research and risk analysis, covering a diverse portfolio of oil and natural gas issuers. Prior to that, Mr. Doss spent more than seven years of his career in public accounting at Ernst & Young LLP serving clients in the oil and natural gas industry.

He earned a Bachelor of Business Administration and Master of Professional Accounting from the University of Texas at Austin. Mr. Doss also earned a Master of Business Administration from Columbia Business School.

Buddy Petersen, Chief Operating Officer

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Buddy Petersen has served as our Chief Operating Officer, or COO, since October 2015. He joined our Company in June 2015 as Senior Vice President, Continuous Improvement and was named Senior Vice President of Operations and Wireline in August 2015. He has over 25 years of experience in the oil and natural gas industry. Prior to joining our Company, Mr. Petersen was COO of GoFrac LLC, an oil and natural gas stimulation company from October 2014 to June 2015, Vice President of Sales for Frac-Chem Inc., an oilfield chemical manufacturer and supplier and an affiliate of Koch Industries, from August 2013 to October 2014, President and COO of Compass Well Services LLC, a hydraulic fracturing and cementing services company from October 2010 to August 2013, and COO of Allied Cementing Co., a company providing cementing and acidizing services to the oil and natural gas industry from October 2007 to October 2010.

Mr. Petersen spent 14 years working in various roles of increasing responsibility with Halliburton Energy Services, or Halliburton, an oilfield services and products company. In April 2017, Mr. Petersen joined the board of directors of L.O. Transport, Inc., a company that provides transportation services to oil and gas producers. He earned a bachelor’s degree in civil engineering from New Mexico State University.

Lance Turner, Chief Financial Officer

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Lance Turner has served as our Chief Financial Officer and Treasurer since October 2015. He joined our Company in April 2014 as Director of Finance and was promoted to Vice President of Finance in January 2015. Prior to joining our Company, Mr. Turner spent approximately 11 years with Ernst & Young LLP, with the majority of that time in their transaction services group coordinating and advising clients on buy side and sell side transactions in various industries. He earned a Bachelor of Business Administration and Master of Professional Accounting from the University of Texas at Austin and is a Certified Public Accountant in the state of Texas.

Karen D. Thornton, Chief Administrative Officer

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Karen D. Thornton has served as our Chief Administrative Officer since March 2017. Ms. Thornton previously served as our Vice President of Human Resources from the time she joined our Company in March 2014. Prior to joining our Company, she was an independent consultant at Alkat Consulting and served as the Strategic Human Capital Management Lead focusing on human resources and payroll application implementations for Darling Ingredients Inc., an Irving, Texas company providing a global growth platform for the development and production of sustainable natural ingredients, from June 2013 to March 2014.

Prior to Alkat Consulting, Ms. Thornton served in various leadership positions, including the Vice President, Human Resources & Management Services for the Emergency Medical Services Corporation in Dallas, Texas, from 2001 to 2012. Ms. Thornton received her Bachelor of Science Industrial Management from Purdue University and her Master of Business Administration from The University of Texas at Austin’s Red McCombs School of Business.

Perry A. Harris, Senior Vice President, Commercial

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Perry A. Harris has served as our Senior Vice President, Commercial since July 2015. Mr. Harris joined our Company as Senior Vice President of Wireline Operations in December 2014 upon our acquisition of J-W Wireline Company, a case-hole wireline company. Prior to the acquisition, Mr. Harris was President of J-W Wireline Company from February 2012 to December 2014. He has more than 36 years of experience in the oil and natural gas industry, including over 24 years at Halliburton. At Halliburton, Mr. Harris held various leadership positions, including Northeast U.S. Area Operations Manager, Northeast U.S. Senior District Manager and Wireline Global Business Development, Marketing & Technology Manager. He earned a bachelor’s degree in mining engineering from West Virginia University.

Jennifer L. Keefe, Senior Vice President, General Counsel and Chief Compliance Officer

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Jennifer L. Keefe has served as our Senior Vice President, General Counsel and Chief Compliance Officer since March 2017. Ms. Keefe previously served as our Deputy General Counsel managing our Commercial Litigation, Employment Compliance and Risk Departments from the time she joined our Company in September 2014. Prior to joining our Company, she was a partner in the Dallas, Texas office of the international law firm of Squire Patton Boggs, where she joined in February 1997. Ms. Keefe received her Bachelor of Arts in Political Science and Spanish from Vanderbilt University and her Juris Doctor from Southern Methodist University Dedman School of Law. She is licensed to practice law in the state of Texas.