Matthew Gallagher

Pioneer Natural Resources Co. operates as an independent oil and gas exploration and production company. The firm engages in hydrocarbon exploration in the Cline Shale. It focuses on the operation of the Permian Basin, Eagle Ford Shale, Rockies, and West Panhandle projects. The company was founded by Scott Douglas Sheffield on April 2, 1997, and is headquartered in Irving, TX.

Natural Gas Partners LLC (NGP) is a private equity firm, a subsidiary of NGP Energy Capital Management, LLC founded in 1988 by David Russell Albin and Kenneth Alfredo Hersh. The firm is headquartered in Dallas, Texas.

Pioneer Southwest Energy Partners LP was a master limited partnership, which owns and acquires oil and gas assets. The company's assets consist of non-operated working interests in producing wells in the Spraberry field in the Permian Basin of West Texas. Its area of operations consisted of onshore Texas and eight counties in the southeast region of New Mexico. Pioneer Southwest Energy Partners was founded in June 2007 and was headquartered in Irving, TX.

Riverside Partners LLC /New York/ (Riverside Partners) is a private equity firm founded in 1988 by Bela Szigethy. The firm is headquartered in Boston, Massachusetts with additional offices across the globe.

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.

Permian Basin Petroleum Association engages in the oil and gas exploration. It provides a wide variety of membership services to producers, service companies, employees, affiliates and families. The company was founded in 1961 and is headquartered in Midland, TX.