William Granberry

Legacy Reserves LP is an oil and natural gas limited partnership company. It focuses on the acquisition and development of oil and natural gas properties primarily located in the Permian Basin, Mid-Continent and Rocky Mountain regions of the United States. The company's projects include East Texas, Spraberry/War San, Piceance Basin, Lea, Texas Panhandle, Deep Rock, Shafter Lake, Jalmat, Winchester, and Denton. Legacy Reserves was founded in October 26, 2005 and is headquartered in Midland, TX.

Legacy Reserves GP LLC, operating under the name Revenir Energy Inc., is an independent energy company that develops, produces, and acquires oil and natural gas properties. Revenir Energy Inc. is based in Midland, TX. The private company's current operations are focused on the horizontal development of unconventional plays in the Permian Basin and East region.

Tom Brown, Inc. engages in the exploration for and the acquisition, development and production of, natural gas, natural gas liquids and crude oil. It also engages in the marketing, gathering, processing and sale of natural gas and the drilling of gas and oil wells. The company is headquartered in Denver, CO

Society of Petroleum Engineers, Inc. provides petroleum engineering services. The non-profit company is based in Allen, TX and has subsidiaries in United States, India and Canada.

American Petroleum Institute (API) is the only national trade association that represents all aspects of America's oil and natural gas industry. Its more than 400 corporate members, from the largest major oil company to the smallest of independents, come from all segments of the industry. They are producers, refiners, suppliers, pipeline operators and marine transporters, as well as service and supply companies that support all segments of the industry.