Board Of Directors

Mammoth | Energy

Arthur Amron

Chairman

Mr. Amron has served as one of our directors since January 2019. Until December 31, 2023, Mr. Amron was a Partner and the General Counsel of Wexford Capital LP (“Wexford”), an SEC-registered investment advisor. He joined Wexford as General Counsel in 1994 and became a Partner in 1999. During the time he was employed by Wexford, Mr. Amron actively participated in various private equity transactions, particularly in the bankruptcy and restructuring areas, and served on the boards and creditors’ committees of a number of public and private companies in which Wexford has held investments. Mr. Amron is currently, and for over 10 years has been, a director of Nephros, Inc., a public commercial stage medical device company (NASDAQ: NEPH). From 1991 to 1994, Mr. Amron was an associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law, and from 1984 to 1991, Mr. Amron was an associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University, a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar.

Phil Lancaster

Director

Mr. Lancaster has served as one of our directors since July 2025. Mr. Lancaster currently serves as a Vice President of Peak Utility Services Group, Inc. Previously, Mr. Lancaster served as the Chief Executive Officer and Vice President of Corporate Development at Mammoth Energy Services, Inc. Mr. Lancaster also served as interim President of Cobra Acquisitions LLC, Higher Power Electrical LLC and 5 Star Electric LLC, Mammoth’s infrastructure subsidiaries, from June 2019 to November 2019. Prior to these positions, Mr. Lancaster served as President of Mammoth Energy Partners LP. from 2014 to 2015, as Chief Executive Officer of Redback Energy Services LLC from 2011 to 2015 and as Chief Executive Officer of Great White Energy Services, Inc. from 2006 to 2010, each an oil field services company. From 2010 to 2011, Mr. Lancaster was a consultant to Wexford Capital LP in connection with energy-related investments. Mr. Lancaster previously served on the boards of directors of two public companies, Bronco Drilling Company, Inc., a drilling company, from August 2005 until July 2006, and Gulfport Energy Corporation, an exploration and production company, from February 2006 until August 2006. Mr. Lancaster received a Bachelor of Science degree from the David Lipscomb College.

Mark Plaumann

Director

Mr. Plaumann has served as one of our directors since June 2025. Mr. Plaumann 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 currently serves as a director of Diamondback Energy, Inc. and a member of its audit committee. 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.

Jim Palm

Director

Mr. Palm has served as one of our directors since June 2017. Mr. Palm most recently served as a director of Gulfport Energy Corporation (“Gulfport”) from February 2006 and as Chief Executive Officer of Gulfport from December 2005, in each case until his retirement in February 2014. Prior to joining Gulfport, Mr. Palm pursued oil and gas investments primarily in Oklahoma, the Texas Panhandle and Kansas as the manager and owner of Crescent Exploration, LLC, a company he founded in 1995. Mr. Palm currently serves as a member of the Industry Advisory Committee of the Oklahoma Corporation Commission. From October 2001 through October 2003, Mr. Palm served as the Chairman of the Oklahoma Energy Resources Board. From 1997 through 1999, Mr. Palm served as the President of the Oklahoma Independent Petroleum Association. Mr. Palm received a Bachelor of Science degree in Mechanical Engineering in 1968, and a Masters in Business Administration in 1971, both from Oklahoma State University.

Paul Jacobi

Director

Mr. Jacobi has served as one of our directors since June 2020. Since 1996, Mr. Jacobi has served in various positions at Wexford Capital and is currently a managing director responsible for Wexford’s private equity energy investments. From 1995 to 1996, Mr. Jacobi worked for Moody’s Investors Services as an analyst covering the investment banking and asset management industries. From 1993 to 1995, Mr. Jacobi was employed by Kidder Peabody & Co. as a senior financial analyst in the investment banking group. From 1988 to 1993, Mr. Jacobi worked for KPMG Peat Marwick as an audit manager in the financial services practice. Mr. Jacobi holds a BS in accounting from Villanova University.

Corey Booker

Director

Dr. Corey Booker has served as one of our directors since August 2020. Dr. Booker is a maternal-fetal medicine specialist who focuses on high-risk pregnancies. He is the founder/CEO of OnPulse, a company that helps employers manage their healthcare expenditures while improving their employee outcomes. He also serves on the Board of Trustees for HarborPath, Inc., a non-profit patient assistance program, and on the Board of Trustees for Trinity School of Durham and Chapel Hill, an independent school for students in grades K through 12.

Dr. Booker attended the University of Maryland, College Park where he received a Bachelor of Science in Neurobiology and Physiology. He attended medical school at Creighton University where he served as a Washington Health Policy Fellow at the National Committee for Quality Assurance (NCQA). He completed his residency at Penn State Milton S. Hershey Medical School and went on to complete a fellowship in Maternal-Fetal Medicine at the University of North Carolina at Chapel Hill. While in fellowship, he received a master’s degree in Clinical Informatics from the Fuqua School of Business at Duke University.