Management Team



    Lisa A. Stewart

    Executive Chairman and

    Chief Investment Officer


    Lisa Stewart serves as Executive Chairman, President, Chief Executive Officer and Chief Investment Officer and oversees all aspects of Sheridan acquisitions and the implementation of Sheridan’s strategy. Ms. Stewart brings over 30 years of experience in the oil and gas industry in engineering and management positions. Prior to founding Sheridan I in 2007, Ms. Stewart served as Executive Vice President of El Paso Corporation and President of El Paso E&P and other non-regulated businesses. In those positions, Ms. Stewart had overall responsibility for a large and diverse E&P company that generated operating revenue of $1.8 billion and earnings of $699 million during the twelve months ended June 30, 2006, and that had 2006 budgeted capital expenditures exceeding $1 billion. During her time at El Paso E&P, Ms. Stewart was responsible for a substantial turnaround in profitability and drilling success in what had been a distressed business. Her success was achieved by rebuilding the division, including reorganizing and recruiting a substantially new management team, infusing a culture of teamwork and accountability and focusing on profitability rather than solely on production growth. Prior to her time at El Paso, Ms. Stewart spent 20 years at Apache, leaving in January 2004 as Executive Vice President with responsibility for reservoir engineering, business development, land, environmental, health and safety and corporate purchasing. Ms. Stewart holds a B.S. in Petroleum Engineering from the University of Tulsa, where she is a member of the College of Engineering and Natural Sciences Hall of Fame. She is a member of the Society of Petroleum Engineers and IPAA and serves on the Board of Directors of Cimarex Energy Co.



    Shannon (Shane) E. Young, III

    Vice President and

    Chief Financial Officer


    Shane Young serves as Vice President and Chief Financial Officer for Sheridan and is responsible for its finance organization, including accounting, treasury, tax, planning and information technology.   Prior to joining Sheridan in 2016, Mr. Young served in similar positions with Cobalt International Energy, Inc., and Talos Energy LLC.  Previously, Mr. Young served as a Managing Director at Goldman, Sachs & Co. from 2010 to 2014 and before that was an investment banker at Morgan Stanley from 1998 to 2010.  Over Mr. Young's investment banking career, he was responsible for client relationships and project execution for clients in the exploration and production space.  He advised clients on a broad range of public and private capital raising and M&A assignments.  Mr. Young serves on the board of directors of Q-Max Solutions, a leading global provider of drilling and completion fluids as well as solids control and waste management services.  Additionally, Mr. Young is a member of the Executive Council of the Kay Bailey Hutchison Center for Energy, Law and Business at the University of Texas at Austin.  Mr. Young earned a B.B.A. in Finance from the University of Texas at Austin and an M.B.A. with distinction from the Tuck School of Business at Dartmouth College.



    Thomas E. Voytovich

    Vice President and

    Chief Operating Officer


    Tom Voytovich joined Sheridan Production Company in December 2015 as Vice President and Chief Operating Officer with management responsibility for Sheridan’s technical and operational functions. Mr. Voytovich has over 38 years of industry experience. Prior to joining Sheridan, he spent 22 years at Apache Corporation in roles of increasing responsibility including Reservoir Engineer, Geological Advisor, Exploration Manager, Vice President of Apache’s Central Region (Oklahoma, the Permian Basin and East Texas) and Vice President and General Manager of Apache Egypt Companies, where he managed the activities of two joint venture companies as well as relations with the national oil company of Egypt (EGPC). In February 2013 Mr. Voytovich was named Executive Vice President of International, responsible for the company’s assets in Argentina, Australia, Canada, Egypt and North Sea. In January 2014, he became Apache’s COO-International with management responsibility for global operations outside of onshore North America. In June 2015, he was appointed Apache’s Executive Vice President of International, Offshore and Technology. Prior to Apache, he served as Exploration Manager of Hillin-Simon Oil Company, worked as a geologist for Berexco Inc, and served in roles of increasing responsibility in both geology and engineering for Petro-Lewis Corporation and Shell Oil Company. Mr. Voytovich holds a B.S. in Geological Engineering from Michigan Technological University and has been a Member of the Academy of Geological and Mining Engineering and Sciences at Michigan Tech since 2014. He is a certified Petroleum Geologist and is a member of the American Association of Petroleum Geologists.



    R. Todd Levesque

    Vice President of Operations


    Mr. Levesque was named Sheridan's Vice President of Operations in March 2018.  Prior to joining Sheridan, Mr. Levesque held positions at Sabine Oil and Gas commencing in 2007, most recently as Executive Vice President and Chief Technical Officer.  Prior to Sabine, Mr. Levesque held roles of increasing responsibility with Hess, Burlington Resources, Ocean Energy and Devon.  Mr. Levesque holds a B.S. in Petroleum Engineering from Texas A&M University.



    Mark Miertschin

    Vice President of Business

    Development and Marketing


    Mark Miertschin serves as Sheridan’s Vice President of Business Development & Marketing. 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. Mr. Miertschin is a member of the Houston Producers Forum.



    Cheryl S. Phillips

    Vice President, General Counsel,

    Chief Compliance Officer and Secretary


    Cheryl S. Phillips serves as Sheridan’s Vice President, General Counsel, Chief Compliance Officer and Secretary. Before joining Sheridan in 2014, she was a partner in the law firm of Andrews Kurth LLP, where her practice focused primarily on oil and gas transactions. She has extensive experience with negotiation of oil and gas acquisition, divestiture and joint venture agreements, as well as a broad range of experience handling other oil and gas exploration and production transactions. Ms. Phillips began her legal career in 1989 with Mayor, Day, Caldwell & Keeton, LLP, where she practiced until its merger with Andrews Kurth LLP in 2001. She holds a J.D. from the University of Houston Law Center and a B.A. in Biology and Political Science from Rice University.




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