Mark Berg

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 is an independent exploration and production company focused on delivering competitive and sustainable results. Pioneer responsibly produces oil and gas resources to help meet the world's energy demands as it provides opportunities for growth and enrichment to employees, business partners and the communities in which the Company operates.

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.

Vinson & Elkins LLP provides legal services. It maintains civil practice, covering areas such as litigation, public policy, transaction, and energy law. The firm serves the clients including companies from the aviation, energy, financial services, health care, and technology industries. The company was founded in 1917 and is headquartered in Houston, TX.

State Bar of Texas provides legal educational programming services. The private company is based in Austin, TX.