Management Team

Ralph A. Hill

Chief Executive Officer

Ralph was appointed as Chief Executive Officer and Chairman of ETX's board of managers in 2014. He has over 30 years of experience in the upstream, midstream and downstream segments of the industry. He served as President and CEO of WPX Energy Inc. from April 2011 to December 2013. As President and CEO, Ralph led the WPX Energy Inc. December 2011 spin out from The Williams Companies, Inc. as a pure play exploration and production company. From June 2002 to April 2011, Ralph was President of Exploration & Production at The Williams Companies, Inc., and from 1996 to 2002, was Senior Vice President of Petroleum Services & Exploration & Production at The Williams Companies, Inc. Ralph also served as CEO and Chairman of the Board for Apco Oil and Gas International Inc. (NASDAQ: APAGF), an international oil and natural gas exploration and production company with interests in Argentina and Colombia from 2002 to 2013. Ralph held numerous roles of increasing responsibility prior to 2002 with The Williams Companies, Inc. Ralph currently serves on the board of directors of the Collins College of Business Board for University of Tulsa, the Trulaske School of Business at the University of Missouri, and the One Mizzou Campaign Cabinet at the University of Missouri. Ralph has also previously served on the board of directors of the Indian Nations Council Boy Scouts of America, America's Natural Gas Alliance, the American Petroleum Institute and American Exploration & Production Council. Ralph holds an MBA in Finance from the University of Tulsa and a B.S. in Business Administration & Finance from the University of Missouri.

Danni Morris

Chief Financial Officer

Danni Morris joined ETX Energy as Chief Financial Officer in September 2014. Danni formerly served as Treasurer for WPX Energy Inc. Danni has a 20 plus year tenure in the energy business having performed most of her career at the Williams Companies, Inc. and WPX Energy. While serving as Treasurer, she also managed the insurance portfolio. Prior to WPX Energy's spinoff from the Williams Companies, Inc. Danni was a Manager in the business development group and led the group in various acquisitions. Danni joined the business development group in 2002, where she worked on acquisitions for Williams – assets that would become critical to WPX Energy – including the Bakken oil play in North Dakota and the Marcellus interests in Pennsylvania. Danni led the $600 million acquisition of certain interests in the company's Marcellus assets in Susquehanna County. In 2000, Danni joined the E&P planning group and was in this role during Williams' acquisition of Barrett Resources in 2001. While at Williams she also worked on the Berkshire loan, various secured financings, E&P's asset sales and the marginless hedge facility. During this time and through 2011, she also managed WPX's hedging program. In her planning, business development and treasury roles at Williams and WPX, Danni has worked on various financial structures such as Section 29 Tax Credit monetizations, volumetric production payments (VPP), master limited partnerships (MLP), royalty trusts, like-kind exchanges, tax partnerships and joint venture drill-to-earn structures with a drilling carry. Additionally, she spent four years in accounting in Williams' E&P and energy groups. Danni began her career in 1993 at Kaiser-Francis Oil Co., where she served in accounting roles. Danni earned a bachelor's degree in Business Administration and Finance from Northeastern State University, magna cum laude in 1993. She also earned an MBA from the University of Tulsa, graduating with honors in 2002. Danni serves on the executive board of Emergency Infant Services in Tulsa.

Mark K. Castell

Senior Vice President of Engineering

Mark K. Castell serves as Senior Vice President of Engineering for ETX Energy in Tulsa, Oklahoma. Previously, Mark served as Vice President - Oklahoma Assets in Tulsa from 2009 to September 2016 in a leader role for publicly traded PetroQuest Energy, LLC. During this period, PetroQuest executed over 300 primarily unconventional Woodford Shale horizontal wells in the Arkoma Basin, making PetroQuest and their joint venture partner, the largest unconventional operator in the Basin. He first joined PetroQuest in 2002 as an Asset Manager in Business Development. He was involved in PetroQuest Energy's expansion into East Texas, and the Fayetteville and Woodford Shales of the MidContinent.

Prior to joining PetroQuest, Mr. Castell spent fifteen years in technical, supervisory, and management positions with Chevron and Tenneco. Mr. Castell has experience in the MidContinent, East Texas, South Texas, Gulf Coast, and Gulf of Mexico in the US, and in Angola West Africa and the Central North Sea. He has strong background in unconventional resources, drilling and completions, oil and gas reserve evaluation techniques, carbonate reservoirs, economics, and acquisition/sales negotiations. Mr. Castell specializes in the redevelopment of mature fields. Mr. Castell has a wide range of engineering skills and has been involved in major secondary recovery projects internationally via gas and water injection. He has also worked on valuation techniques for stranded gas and concession negotiations in the international arena.

Mr. Castell earned a Bachelor of Science Degree Magna Cum Laude in Petroleum Engineering from Texas A&M University in 1987. He is a Registered Petroleum Engineer in the State of Louisiana, and a member of the Society of Petroleum Engineers and American Association of Petroleum Geologists.

John Sharp

Senior Vice President of Geology and Geophysics

As Senior Vice President of Geology and Geophysics, John brings to ETX Energy exceptional strengths in resource play identification and delineation as well as team building and value creation. In a career that spans over thirty-three years in exploration and production, John has been a key player in several U.S. discoveries, most notably as the geoscience leader for Chesapeake's Haynesville Shale discovery in Louisiana, which has grown into one of the world's largest natural gas fields.

Prior to joining ETX Energy, John was Vice President of Exploration and Business Development for Samson Resources. Before that, he was Vice President of Geoscience, Southern Division at Chesapeake Energy. In that role, John was responsible for all aspects of geoscience activity within the Haynesville, Bossier, Barnett and Eaglebine plays, as well as the company's New Ventures team. John led the technical efforts that resulted in the generation and development of the Haynesville Shale play, where Chesapeake ultimately obtained the largest leasehold position in this important region.

A true team player, John's previous experience includes key technical and managerial positions at companies including Marathon, Transfuel Resources and EOG Resources.

John received his Bachelor of Science in Geology with High Honors from the University of Arkansas as well as a Masters of Geology from the University of Arkansas. He serves on the External Advisory Board of the University of Arkansas Geoscience Department.