William S. Buckler

Quicksilver Resources, Inc. was engaged in the acquisition, exploration, development and production of onshore oil and gas in North America. It operated through the Midstream and Exploration & Production segments. The Midstream segment provided natural gas gathering and processing services. The Exploration and Production segment focused on oil and natural gas industry. The company was founded in 1997 and was headquartered in Chester, OH.

Approach Resources, Inc. engages in the exploration, development, production, and acquisition of oil and gas properties. It focuses on oil and natural gas reserves in oil shale and tight sands located in the Permian Basin in West Texas. It holds interests in the East Texas Basin and the Chama Basin in Northern New Mexico. The firm operates in one business segment, the exploration and production of oil, NGLs and natural gas. The company was founded by J. Ross Craft in September 2002 and is headquartered in Fort Worth, TX.

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.