Management Team



    Mark A. Miertschin

    President and

    Chief Executive Officer


    Mark Miertschin was named President and Chief Executive Officer in April 2020.  In this capacity he oversees all aspects of Sheridan’s operations and the implementation of Sheridan’s strategy.  Mr. Miertschin brings over 35 years of experience in the oil and gas industry in engineering and management positions.  Prior to April 2020, he served as Sheridan’s Vice President of Business Development & Marketing and coordinated the acquisition of over $5 billion of producing assets.  Before joining Sheridan in 2007, he was Business Development Manager for El Paso E&P. Previously, Mr. Miertschin served as Gulf of Mexico Planning Manager for Unocal, Acquisitions Manager for Nuevo Energy and South America Business Development Manager for Atlantic Richfield Corporation. He holds a B.S. in Civil Engineering and an M.S. in Petroleum Engineering from The University of Texas and an M.B.A. from the University of Houston.



    Richard G. Ghiselin III

    Vice President of Operations


    Richard Ghiselin was named Vice President of Operations in March 2020, and brings more than 25 years of engineering and management experience in the oil and gas industry.  Prior to March 2020, he was Sheridan’s Production Engineering Manager.  Prior to joining Sheridan in 2014, he was Vice President of Drilling & Completions and VP of Operations for Plantation Petroleum and RPM Energy, respectively.  His experience spans all phases of operations and he has worked multiple basins in the Lower 48, including drilling and completions roles in East Texas and North Louisiana with NFR Energy and El Paso E&P.  Richard began his career in the Permian Basin with Dowell Schlumberger in 1992 after graduating from Texas A&M University with a B.S. in Petroleum Engineering.



    Aaron Skidmore

    Vice President and
    Chief Financial Officer


    Mr. Skidmore joined Sheridan in January 2019 as Manager, Planning and Investor Relations and was named Vice President, Chief Financial Officer in August 2019.  His areas of responsibility include investor relations, accounting, finance, IT and land administration.  Mr. Skidmore has over 15 years of experience, most recently with Cobalt International Energy, where he served as Treasurer and Director of Investor Relations.  Before joining Cobalt, he held roles of increasing responsibility with LyondellBasell Industries and Oasis Petroleum, after starting his career with PricewaterhouseCoopers.  He holds a B.S. in Accounting from Brigham Young University.



    Matthew R. Heintz

    Vice President, General Counsel,

    Chief Compliance Officer and Secretary


    Mr. Heintz joined Sheridan in 2007 and was named Vice President, General Counsel, Chief Compliance Officer and Secretary in April 2020.  During his tenure at Sheridan, he has held positions of increasing responsibility in the legal department in respect of oil and gas acquisitions and divestitures, finance, hedging, securities compliance, fundraising and other corporate and transactional matters.  Prior to Sheridan, Mr. Heintz served as in-house counsel to the business development group of Apache Corporation from 2003.  He began his legal career at Orrick, Herrington and Sutcliffe LLP and later, Vinson and Elkins LLP.  Mr. Heintz holds a J.D. from New York University School of Law and a B.S. in Mechanical Engineering from Texas A&M University.



    Frank Belveal

    Vice President Corporate Development


    Mr. Belveal was named Vice President Corporate Development in June 2021.  He joined the Sheridan team in 2013 and has held various positions during his tenure including engineering and business development roles.  Prior to joining Sheridan, Mr. Belveal was Group Lead – Technical Completions for Encana (Ovintiv), where he focused on conventional and unconventional HPHT operations and was integrally involved in the initial delineation and evaluation of the Haynesville Shale.  Frank graduated from Texas A&M University in 2006 with a B.S. in Petroleum Engineering.




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