E. L. Ames, Jr. Venus Oil Company Eduardo Assef CITGO Petroleum Corporation David Banks BHP Billiton Petroleum Mark Berg Pioneer Natural Resources Company Roe Buckley Mewbourne Oil Company Obie O'Brien Apache Corporation Dennis Cameron WPX Energy Randy Cleveland ExxonMobil Dan Cole Denbury Resources Harold D. Courson Natural Gas Anadarko Company John Dill Chesapeake Energy Corporation David Erfert Phillips 66 Allan D. Frizzell Enrich Oil Corporation Rick Gideon Devon Energy Gregory Givens EP Energy Eric Hambly Murphy Oil Greg Hardin OXY USA Inc. Helene Harding ConocoPhillips William Herbert Hunt Petro-Hunt, L.L.C. Forrest E. Hoglund Hoglund Interests Albert Hrubetz Hrubetz Oil Company Dan Allen Hughes, Jr. Dan A. Hughes Co., L.P. A. V. Jones, Jr. Van Operating, Ltd. Jon Rex Jones Jones Management Corporation Jonny Jones Jones Energy, Ltd. David W. Killam Killam Oil Company, LTD. Dale Kokoski Marathon Oil Company David Lawler BP America, Inc. Charlie Moncrief Montex Drilling Company W. A. Moncrief, Jr. Moncrief Oil Company Donnie Moore Noble Energy Matthew Most Encana Oil & Gas (USA) Bruce Niemeyer Chevron Joseph I. O’Neill, III O'Neill Properties, Ltd. Bruce Palfreyman Shell Upstream Americas - Unconventionals Harry H. Phillips Philcon Development Company Frederick Plaeger EOG Resources, Inc. Robert K. Reeves Anadarko Petroleum Corporation Corbin J. Robertson, Jr. Quintana Minerals Corporation Douglass C. Robison ExL Petroleum, LP Gary Simmons Valero Energy Corporation Alan Smith Quantum Resources Managment, LLC Ty Thacker 3-T Exploration, Inc. William M. Thacker, Jr. 5-T Properties, LTD Herb Vogel SM Energy E. Joseph Wright Concho Resources, Inc. John H. Young John H. Young, Inc./Joy Resources, Inc.