Dave E. Leopold

Anadarko Petroleum Corp. is an independent exploration and production company. It operates through the following segments: Exploration and Production; WES Midstream; and Other Midstream. The Exploration and Production segment focuses on the exploration, development, production, and sale of oil and natural gas. The WES Midstream and Other Midstream segment consists of gathering, compressing, treating, processing, and transporting of natural gas; gathering, stabilizing, and transporting of oil and natural gas liquids. The company was founded in 1959 and is headquartered in The Woodlands, TX.

Plains Petroleum Co. produces, develops, and explores oil & gas. The company provides services in the Midcontinent, Permian Basin, Gulf coast, and Rocky Mountain regions of the United States. The company is headquartered in Lakewood, CO.

Part of Occidental Petroleum Corp., Union Pacific Resources, Inc. is a private company that is involved in railroads, gas, and oil production. The company is based in Bethlehem, PA.

Atlas Resources Public #17-2007 (A) LP engages in the development and production of natural gas, crude oil, and natural gas liquids. It currently drill and operate wells located in Pennsylvania, Tennessee, and West Virginia. The company was founded on May 7, 2007 and is headquartered in Pittsburgh, PA.

Atlas Resources Series 28-2010 LP operates oil explorations. The company was founded in April 1, 2010 and is headquartered in Pittsburgh, PA.

Atlas Resource Partners LP is an exploration and production master limited partnership. It develops and produces natural gas, crude oil and natural gas liquids, with operations in basins across the United States. The company also sponsors and manages tax-advantaged investment partnerships, in which it co-invests, to finance a portion of natural gas and oil production activities. It also operates its business through following segments: Oil & Gas production, Well construction & completion and Other partnership management. Atlas Resource Partners was founded in October 2011 and is headquartered in Pittsburgh, PA.

Atlas Growth Partners LP engages in the production of natural gas and oil. It focuses on the development and growth of energy enterprises. The company was founded in February 2013 and is headquartered in Philadelphia, PA.

Texas Oil & Gas Association engages in operation of a statewide trade association representing the Texas oil and gas industry. It provides crude oil and natural gas. The company was founded in 1919 and is headquartered in Austin, TX.