Thomas J. Murphy

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.

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.

Pioneer Natural Resources Gp LLC engages in the exploration and production of natural gas and liquids. The private company is based in Irving, TX.