Board of Directors

Chairman of the Board

Phillip Gobe began serving as Chairman of our board in July of 2019 and Executive Chairman of ProPetro in October 2019. Mr. Gobe previously served on the Board of Directors at Pantheon Resources and Pioneer Natural Resources, prior to their acquisition by ExxonMobil. From 2004 to his retirement in 2007, Mr. Gobe acted as Chief Operating Officer, then President, for Energy Partners, Ltd. Prior to that, Mr. Gobe served three years as Chief Operating Officer of Nuevo Energy Company as well as numerous operations and human resources positions with Vastar Resources, Inc. and Atlantic Richfield Company (“ARCO”). Mr. Gobe received a Bachelor of Arts from the University of Texas and a Master of Business Administration degree from the University of Louisiana in Lafayette.

Chief Executive Officer and Director

Sam Sledge has significant experience with ProPetro having joined ProPetro in 2011. He has served in various capacities throughout his tenure such as a Frac Technical Specialist and Technical Operations Manager where his duties included quality control, planning and logistics, and the development of the engineering program. Mr. Sledge’s most recent leadership roles at ProPetro include Vice President of Finance, Corporate Development, and Investor Relations, as well as Chief Strategy and Administrative Officer, and ultimately President where he was responsible for the Financial, Legal, Human Resources, and Supply Chain functions of ProPetro. He currently serves on the Board of the Permian Strategic Partnership and is the Vice Chairman of the Board of Directors for the Energy Workforce Technology Counsel. Mr. Sledge received a Bachelor of Business Administration and a Masters of Business Administration from Baylor University.

Lead Independent Director

Anthony Best has over forty years of experience in the energy industry. He currently is the Chairman of the Board of Newpark Resources; is a director on the boards of two Quantum portfolio companies, ExL Petroleum and Middle Fork Energy Partners; and has served as a Senior Advisor for Quantum Energy Partners since August 2015. Prior to joining Quantum, Mr. Best served in various roles with SM Energy Company commencing in 2006 as its President and Chief Operating Officer and as its Chief Executive Officer from February 2007 through January 2015. From 2003 to 2005, Mr. Best served as President and Chief Executive Officer of Pure Resources, Inc., a Unocal development and exploration company. From 2000 to 2003, Mr. Best served as an independent consultant offering leadership and oil and gas consultation to energy companies and volunteer organizations. From 1979 through 2000, Mr. Best served in various roles of increasing responsibilities at Atlantic Richfield Company culminating in the position of President, ARCO Latin America. Mr. Best holds a Master of Science in Engineering Management degree from the University of Alaska and a Bachelor of Science in Mechanical Engineering from Texas A&M University. Prior to beginning his business career, Mr. Best served five years as an engineering officer in the United States Air Force.

Spencer D. Armour III has served as a member of our board of directors since February 2013. Mr. Armour has over thirty years of executive and entrepreneurial experience in the energy services industry. He currently serves on the boards for Viper Energy Partners LP and CES Energy Solutions Corp. Mr. Armour served as President of PT Petroleum LLC in Midland, Texas from 2011 to 2018. He was the Vice President of Corporate Development for Basic Energy Services, Inc. from 2007 to 2008. Basic Energy Services acquired Sledge Drilling Corp., a company Mr. Armour co-founded and served as Chief Executive Officer for from 2005 to 2006. From 1998 through 2005, he served as Executive Vice President of Patterson-UTI Energy, Inc. when Patterson-UTI Energy, Inc. acquired Lone Star Mud, Inc., another company Mr. Armour founded and served as President for from 1986 to 1997. He also served on the Patterson — UTI Board of Directors from 1999 through 2001. Mr. Armour received a Bachelor of Science in Economics from the University of Houston in 1977, and was appointed to the University of Houston System Board of Regents in 2011 by former Texas Governor, Rick Perry.

Mark Berg, who joined our Board of Directors in 2019, is a senior energy industry executive with extensive commercial and operational experience, including leadership of strategic planning, business development, land, water management, completion and well services, environmental, sustainability, legal, government relations and communications. During his 20-year career with Pioneer Natural Resources, first as General Counsel then as EVP Corporate Operations, Mark played a key role in transforming the company into a major U.S. shale resource developer. He also led the negotiating team for the $65 billion merger with ExxonMobil and multiple multibillion-dollar mergers, global divestitures, and cross-border joint ventures. Mark began his career with the law firm Vinson & Elkins, becoming a partner focused on M&A and international project development. As General Counsel at American General Corporation, he ultimately oversaw its $27 billion merger with AIG. Upon joining Hanover Compressor Company, he instituted disciplined internal controls, quickly resolved an SEC investigation, and settled securities class action litigation. Mark serves the community as founding Vice Chairman of the Permian Strategic Partnership and as Board Member of Dallas CASA. Mark received his Juris Doctor from the University of Texas School of Law and graduated Phi Beta Kappa with a Bachelor of Arts in Public Policy from Tulane University.

Larry Lawrence began serving our board of directors in December of 2020. Mr. Lawrence previously served as Audit Committee Chair of Legacy Reserves, LLP’s Board of Directors, a role he held from 2006 to 2019. From January 2021 until June 2021, Mr. Lawrence served as the interim Chief Financial Officer of Natural Gas Services Group where he previously served as Chief Financial Officer for nine years. Prior to Natural Gas Services Group, Mr. Lawrence served as Chief Financial Officer for Lynx Operating Co. Inc. for three years and as Chief Financial Officer for Pure Resources, Inc. for two years. He has also held finance and management consulting positions for Parson Group, ARCO and Crescent Consulting. Mr. Lawrence earned his bachelor’s degree with an accounting major from Dillard University in New Orleans.

Jack B. Moore became a member of our board of directors in March 2017. Mr. Moore served as Chairman of the Board of Cameron International Corporation from 2011 until it was acquired in April 2016. Mr. Moore worked at Cameron International Corporation from 1999 until 2014, serving as Chief Executive Officer from 2008 to 2015 and as President from 2008 to 2014. Prior to his employment with Cameron International Corporation, he held various management positions at Baker Hughes Incorporated where he was employed for twenty-three years. Mr. Moore currently serves on the board of directors of Occidental Petroleum Corporation, KBR Inc., and the University of Houston System Board of Regents. Mr. Moore also previously served on the board of directors of the American Petroleum Institute, the National Ocean Industries Association, Rowan Companies plc, and the Petroleum Equipment Suppliers Association. Mr. Moore received a Bachelor of Business Administration from the University of Houston and is a graduate of the Advanced Management Program at Harvard Business School.

Ms. Ricciardello has extensive public company board experience and currently serves as a director, Audit Committee member, and Corporate Governance & Nominating Committee member at Eagle Materials Inc. Ms. Ricciardello previously served as a director at Devon Energy, Noble Corporation, Enlink Midstream, Midstates Petroleum, and U.S. Concrete. Ms. Ricciardello enjoyed a distinguished, two-decade career at Reliant Energy, where she served in key roles including Senior Vice President and Chief Accounting Officer. She earned a Bachelor of Arts degree from the University of South Dakota and a Master’s in Business Administration from the University of Houston. She is also a Texas-licensed Certified Personal Accountant.

Michele Vion began serving our board of directors in February of 2020. Ms. Vion previously served as Compensation Committee Chair and as a member of the Audit Committee of Boingo Wireless, Inc.’s Board of Directors, roles she held from 2018 until Boingo’s acquisition by Digital Colony Management, LLC in June 2021. She additionally served as Chair of the Compensation Committee, member of the Audit Committee and member of the Nominating and Corporate Governance Committee for CallidusCloud, Inc. from 2005 to 2016. Ms. Vion served as Vice President of Human Resources for Highpoint Resources for nine years, as Group Vice President of Human Resources for Level 3 Communications, Inc. for four years and as Vice President of Human Resources for Sun Microsystems, Inc. for seven years. She has previously held human resources and client account management positions for Prudential, JP Morgan and Sony Corporation. Ms. Vion earned her bachelor’s degree from Wesleyan University, has attended Stanford University’s Director’s College and participated in the Financial Times’ Director Exchange.

Alex Volkov is a seasoned executive with almost three decades of experience in various roles within ExxonMobil. Beginning his journey with the company in 1997, Mr. Volkov has navigated through diverse assignments spanning marketing, business development, supply chain logistics, and strategy development. His international experience includes serving as Vice President of Exxon Neftegas Limited in Moscow, overseeing commercial activities in Russia, and later moving to the United Kingdom to lead international natural gas marketing and trading efforts. In 2019, Mr. Volkov transitioned to Houston as Vice President, Global LNG Marketing, overseeing ExxonMobil’s LNG portfolio globally, a position he held until 2021. Between 2021 and 2023, he held positions as Vice President, Commercial & Power and then as Vice President, Strategy and Business Development, culminating in his current role as Transition Executive – Pioneer. Mr. Volkov is a graduate of The University of Nizhni Novgorod, Russia, and holds an MBA from The University of Alabama.