Board of Directors

Mr. Stice has served as our Executive Chairman of the Board since May 2025. Previously, he served as Chairman of the Board since February 2022 and as our Chief Executive Officer since January 2012. Prior to serving as Chairman of the Board, Mr. Stice was a director of Diamondback since November 2012. Mr. Stice remains as a director of Viper Energy Partners, Inc. (Nasdaq: VNOM), our publicly traded subsidiary, where he served as the Chief Executive Officer from February 2014 to February 2025. He also served as the Chief Executive Officer and as a director of the general partner of Rattler Midstream LP, which was acquired by Diamondback in a merger in August 2022 and is no longer publicly traded, since July 2018. Prior to these positions with Diamondback, Viper and the general partner of Rattler, he served as our President and Chief Operating Officer from April 2011 to January 2012. From November 2010 to April 2011, Mr. Stice served as a Production Manager of Apache Corporation, an oil and gas exploration company. He served as a Vice President of Laredo Petroleum Holdings, Inc., an oil and gas exploration and production company, from September 2008 to September 2010 and as a Development Manager of ConocoPhillips/Burlington Resources Mid Continent Business Unit, an oil and gas exploration company, from April 2006 until August 2008. Prior to that, Mr. Stice held a series of positions of increasing responsibilities at Burlington Resources until that company was acquired by ConocoPhillips in March 2006. He started his career with Mobil Oil in 1985. Mr. Stice graduated from Texas A&M University with a Bachelor of Science degree in Petroleum Engineering. Mr. Stice is a registered engineer in the State of Texas, and is a 43-year member of the Society of Petroleum Engineers. He also serves on industry boards for the Permian Basin Petroleum Association, American Exploration and Production Council, the National Petroleum Council, the Texas A&M Petroleum Engineering Advisory Board, the All-American Wildcatters and the American Petroleum Institute. Additionally, he is on local community boards for Manor Park Retirement Center in Midland, the Midland Memorial Hospital, the Midland Chamber of Commerce and the Dynamic Catholic Institute.

Vincent “Vince” Brooks has served as a director of Diamondback since April 2020.  He is a career Army officer who served in the U.S. Army for over 42 years, retiring from active duty in 2019 as a four-star general. General Brooks spent his final seventeen years as a general officer and in nearly all those years in command of large, complex military organizations in challenging situations. Most recently, from 2016 until his retirement, he was the commander of all Korean and United States forces in the Republic of Korea. In the two positions prior to Korea he served as the commander of all United States Army forces throughout the Indo-Asia Pacific region from 2013 to 2016 during the strategic rebalancing to Asia, and as the commander of all United States Army forces in the Middle East and Central Asia from 2011 to 2013 during the reduction of forces in Iraq and the buildup of forces in Afghanistan, as well as the phenomenon known as “the Arab Spring.” During his tenure in the Army, he gained uncommon experience in leading through complex, ambiguous situations with significant national security interests and risks at stake. He handled crisis management, public communications, risk management and mitigation, budgetary assessment, leadership and management, international relations and interactions, cyber defense and protection, congressional engagement and strategic planning. Since 2020, General Brooks has also served as a director and a member of the compensation committee and nominating and corporate governance committee of Jacobs Solutions, Inc. (NYSE: J ); as a director and member of the nominating and corporate governance committee, the compensation and talent management committee and the risk committee (and previously on Audit Committee) of Verisk Analytics (Nasdaq: VRSK); and as a director and member of the audit committee and the nominating and corporate governance committee of Amentum (NYSE: AMTM). General Brooks has also served as Vice Chair of the board of the not-for-profit Gary Sinise Foundation since March 2019 and as Chair of the board and President of the Korea Defense Veterans Association since February 2020 to February 2023. General Brooks is also a visiting Senior Fellow at Harvard Kennedy School’s Belfer Center for Science and International Affairs, a Distinguished Fellow at the University of Texas with both the Clements Center for National Security and the Strauss Center for International Security and Law, and the President of VKB Solutions LLC. General Brooks holds a Bachelor of Science in Engineering from the U.S. Military Academy at West Point, a Master of Military Art and Science from the U.S. Army School of Advanced Military Studies and holds an honorary Doctor of Laws from the New England School of Law and an honorary Doctor of Humanities from New England Law | Boston. General Brooks qualifies as an independent director under the Nasdaq listing standards. He is a Certified Corporate Director by the National Association of Corporate Directors (NACD) and is NACD Certified in Cyber Security Oversight.

Mr. Holderness has served as a director of Diamondback since February 2025. Mr. Holderness previously served on the board of Rock Solid Lifestyles, Inc. from September 2016 to April 2024. He was also a founder and served as Chief Financial Officer of P&A Exchange LLC from March 2021 to December 2023. Prior to that, Mr. Holderness served on the board of Ranger Oil Corporation (formerly “Penn Virginia Corporation”) from September 2016 to October 2021 where he was appointed chairman of the Audit Committee and then Chairman of the Board from February 2018 until January 2021. Mr. Holderness served as the Chief Financial Officer of ProPetro Holding Corp. from October 2019 to November 2020. Prior to his time at ProPetro, Mr. Holderness served as an advisor to Concho Resources Inc. from May 2016 to January 2017 following his employment at Concho where he served as the Senior Vice President, Chief Financial Officer and Treasurer from August 2008 to May 2016. Before Concho, Mr. Holderness served in various roles in the energy industry including Senior Vice President and Chief Financial Officer of Eagle Rock Energy Partners, Vice President and Chief Accounting Officer of Pioneer Natural Resources Company, Vice President and Chief Financial Officer of Basic Energy Services, Inc., and Vice President and Controller of Pure Resources, Inc. He began his career at KPMG in May 1986 after earning a Bachelor of Business Administration in Accounting degree from Boise State University and is a Certified Public Accountant. Mr. Holderness currently serves on the board of JMR Services LLC. 

Rebecca “Becky” Klein has served as a director of Diamondback since July 2022. Ms. Klein is currently the Principal of Klein Energy, LLC, an energy consulting company based in Austin, Texas. Over the last 25 years, she has worked in Washington, D.C. and in Texas in the energy, telecommunications, and national security arenas. Ms. Klein’s professional experience also includes service with KPMG Consulting (now Deloitte) where she headed the development of the company’s Office of Government Affairs and Industry Relations in Washington, D.C. She also served as a Senior Fellow with Georgetown University’s McDonough School of Business. Ms. Klein was the Chairman of the Public Utility Commission of Texas. She has served as chair of the board of the Lower Colorado River Authority, a public power utility owning generation, transmission, and water services across the central Texas area. In addition, she sits on the boards of Avista Corporation (NYSE: AVA), a publicly traded utility in the Pacific Northwest and SJW Group (NYSE: SJW), a publicly traded water company which operates in California, Texas, Connecticut, and Maine. She is also an independent advisor to Riverbend X, LP, an affiliate of Riverbend Energy Group, focused on making energy transition related investments. She is also the Founder and a director of the Texas Energy Poverty Research Institute. She earned a Juris Doctor from St. Mary’s University School of Law in San Antonio, Texas. Ms. Klein also holds a Master of Arts in National Security Studies from Georgetown University, a Bachelor of Arts in Human Biology from Stanford University, and a Master of Business Administration from MIT. Ms. Klein is a retired Lieutenant Colonel with the U.S. Air Force Reserve. She is a member of the State Bar of Texas. Ms. Klein qualifies as an independent director under the Nasdaq listing standards.

Ms. Mains has served as a director of Diamondback since April 2020.  She has over 30 years of experience across diverse industry segments, including aviation, energy and transportation. Within the last 15 years, Ms. Mains has been building and expanding global businesses serving the oil and gas, utility, distributed power, and electrification spaces. In 2020, she held the interim CEO role for GE Power Conversion, a $1B advanced electrification and digital solutions business, leading the business to a profitable turnaround through COVID-19. From 2015-2019, she served as the President and CEO of Industrial Solutions, a GE and later ABB company.  She led Industrial Solutions, a $2.7B GE business delivering technologies that distribute, protect and control electricity, through a transformation and divestiture to ABB.   From 2013-2015, Ms. Mains served as President and CEO of GE Distributed Power Global Services, where she integrated and grew a $2.2B global business platform, servicing technologies that provide at the point of use power to the oil and gas, utilities, mining, and industrial segments.  From 2006 until 2013, she held positions of increasing responsibility in GE Energy from General Manager to Vice President.  During this time, she led the global build-out and transformation of a $4B service operation providing power equipment and services to utility and oil and gas customers.  Prior to joining GE Energy, she spent 16 years across multiple GE businesses in financial and leadership positions, including CFO of GE Aviation Services-Contractual Services and Material Solutions, a $4B aviation material services business.  Ms. Mains is currently the CEO of LSC Communications-MCL, a portfolio company of Atlas Holdings, LLC.   She serves as a director and audit committee member of Gates Industrial Corporation plc (NYSE: GTES), a director, audit and compensation committee member of LCI Industries (NYSE:  LCII), and is a member of the board of managers for Stryten Manufacturing, a privately held portfolio company of Atlas Holdings, LLC. Ms. Mains holds a B.B.A. in Finance from the University of Kentucky. Ms. Mains qualifies as an independent director under the Nasdaq listing standards.

Mr. Plaumann has served as a director of Diamondback since October 2012. He is currently a Managing Member of Greyhawke Capital Advisors LLC, or Greyhawke, which he co-founded in 1998. Prior to founding Greyhawke, Mr. Plaumann was a Senior Vice President of Wexford Capital LP. Mr. Plaumann was formerly a Managing Director of Alvarez & Marsal, Inc. and the President of American Healthcare Management, Inc. He also was Senior Manager at Ernst & Young LLP. Mr. Plaumann served as a director and audit committee chairman for ICx Technologies, Inc. from 2006 until 2010, served as a director and a member of the audit and compensation committees of   Republic Airways Holdings, Inc. from 2002 until 2017 and currently serves as a director of several private entities. Mr. Plaumann served as a director, an audit committee chairman and a member of the conflicts committee of the general partner of Rhino Resource Partners LP, a coal operating company, from 2010 until 2016. Mr. Plaumann holds an M.B.A. and a B.A. in Business Administration from the University of Central Florida, where he currently serves on the Foundation Board and the Dean’s Advisory Board for the College of Business. We believe that Mr. Plaumann’s service on the boards of other public companies and his executive management experience, including previous experience as chairman of audit committees, qualifies him for service on our board of directors.

Mr. Robertson has served as a director of Diamondback since September 2024. Mr. Robertson previously served as Chief Executive Officer of Endeavor Energy Resources, L.P. Mr. Robertson joined Endeavor as Chief Operating Officer and Senior Vice President of Development in January 2017 and was appointed Chief Executive Officer in 2020. He previously served as Vice President of US Unconventional Resources at Marathon Oil Company where he provided oversight of the North America Unconventional Business Units and Technology Application, Land, Supply Chain and Exploration efforts. Mr. Robertson was a part of Marathon from 2011 to 2016. Prior to his role at Marathon, Mr. Robertson served as Vice President of Engineering and Exploration at Pioneer Natural Resources. Mr. Robertson earned a Bachelor of Science in Petroleum Engineering from Texas A&M University in 1998 and a Master of Business Administration from Southern Methodist University in 2010. Mr. Robertson currently serves on the boards of directors for the Permian Basin Petroleum Association and on Texas A&M University’s Department of Petroleum Engineering Industry Advisory Board.

Ms. Trent has served as a director of the Company since April 2018. Ms. Trent previously served in various legal, administrative and compliance capacities for Rowan Companies plc (now part of Valaris plc), from 2005 until April 2017, including as Executive Vice President, General Counsel and Chief Administrative officer from 2014 until April 2017, as Senior Vice President, Chief Administrative Officer and Company Secretary from 2011 until 2014, and as Vice President and Corporate Secretary from 2010 until 2011. Prior to her tenure at Rowan, Ms. Trent served in various legal, administrative and investor relations capacities for Reliant Energy, Incorporated, served as counsel at Compaq Computer Corporation and as an associate at Andrews Kurth LLP. She serves on the Board of Arcosa, Inc. (NYSE: ACA), a provider of infrastructure-related products and solutions, and chairs its Governance and Sustainability Committee. She also serves on the Board of Hyliion Holdings Corp. (NYSE:HYLN), a developer of KARNO generator and electric powertrain technologies, and chairs the Nominating & Governance Committee. From February 2021 through October 2022, Ms. Trent served on the Board of Noble Corporation, a leading offshore drilling contractor for the oil and gas industry. From January 2019 through October 2021, Ms. Trent served on the Board of Frank’s International N.V., a global tubular and oil and gas services company, which merged with Expro Group Holdings N.V in October 2021. Ms. Trent holds a Bachelor’s degree from Middlebury College and a Juris Doctorate degree from Georgetown University Law Center. We believe that Ms. Trent’s strong legal and executive management experience, diverse background and knowledge of oil and gas and energy industries qualify her for service on our board of directors. In particular, we believe Ms. Trent’s strengths in the following core competencies provide value to our board of directors: Corporate Governance; Mergers and Acquisitions; Finance/Capital Markets; Financial Reporting Experience; Government, Legal & Regulatory; Industry Background; Environmental, Health, Safety & Sustainability; Executive Experience; Executive Compensation; and Risk Management.

Frank Tsuru has served as a director of Diamondback since July 2022. Mr. Tsuru currently serves as Chief Executive Officer and as a member of the Board of Directors of Momentum Midstream, LLC, a privately held midstream company, which he co-founded in 2004. From 2016 through 2021, Mr. Tsuru served as the Chief Executive Officer and as a member of the Board of Directors of Indigo Natural Resources, LLC, which was acquired by Southwestern Energy Company in 2021. In 2002, Mr. Tsuru founded Aka Energy, which was a midstream company focused on acquiring midstream assets off of the Southern Ute Indian Tribe (SUIT) Reservation. Prior to that, Mr. Tsuru ran SUIT’s midstream company, Red Cedar Gathering, from 1995 to 2002. In 1990, Mr. Tsuru founded Southwestern Production, an upstream company focused on coal bed methane development in the San Juan Basin, which was sold to ConocoPhillips. He began his career as a drilling and production engineer for TXO Production Corp. in Denver, Colorado where he was part of the team that evaluated the company’s reserves and provided mergers and acquisitions support. Mr. Tsuru holds a Bachelor of Science degree in Petroleum Engineering from the University of Kansas. He serves on the Board of Trustees of KU Endowment. Mr. Tsuru also sits on the boards of the Boy Scouts of America and the Yellowstone Academy, a private Christian school. Mr. Tsuru qualifies as an independent director under the Nasdaq listing standards.

Mr. Van’t Hof has served as the Chief Executive Officer and as a director of Diamondback since May 2025. Prior to his current position, he served as our President from February 2025 to May 2025, President and Chief Financial Officer from February 2022 to February 2025, Chief Financial Officer and Executive Vice President of Business Development from February 2019 to February 2022, as Senior Vice President of Strategy and Corporate Development from January 2017 to February 2019 and as our Vice President of Strategy and Corporate Development since joining us in July 2016. Mr. Van’t Hof has served as Chief Executive Officer of Viper since February 2025, and as a director of Viper since November 2023. Before joining Diamondback and Viper, Mr. Van't Hof served as Chief Executive Officer for Bison Drilling and Field Services from September 2012 to June 2016. From August 2011 to August 2012, Mr. Van't Hof was an analyst for Wexford Capital, LP responsible for developing operating models and business plans, including for our initial public offering, and before that worked for the Investment Banking - Financial Institutions Group of Citigroup Global Markets, Inc. from February 2010 to July 2011. Mr. Van't Hof was a professional tennis player from May 2008 to January 2010. Mr. Van't Hof received a Bachelor of Science in Accounting and Business Administration from the University of Southern California.

Mr. West has served as a director of our company since December 2011. Mr. West served as our Chief Executive Officer from January 2009 to December 2011 and as our Chairman of the Board from October 2012 through February 2022. From January 2011 until December 2016, Mr. West was a partner at Wexford Capital LP, or Wexford Capital, focusing on Wexford Capital’s private equity energy investments. From August 2006 until December 2010, Mr. West served as senior portfolio advisor at Wexford Capital. From August 2003 until August 2006, Mr. West was the Chief Financial Officer of Sunterra Corporation, a former Wexford Capital portfolio company. From December 1993 until July 2003, Mr. West held senior financial positions at Coast Asset Management and IndyMac Bank. Prior to that, Mr. West worked at First Nationwide Bank, Lehman Brothers and Peat Marwick Mitchell  & Co., the predecessor of KPMG LLP. Since February 2014, Mr. West has also served as Chairman of the Board of Viper Energy, Inc. (Nasdaq: VNOM). From May 2019 through August 2022, he served as Chairman of the Board of Rattler Midstream LP, which was acquired by Diamondback in a merger in August 2022 and is no longer publicly traded. Mr. West holds a Bachelor of Science degree in Accounting from California State University, Chico. We believe Mr. West’s background in finance, accounting and private equity energy investments, as well as his executive management skills developed as part of his career with Wexford Capital, its portfolio companies and other financial institutions qualify him to serve on our board of directors.