James Trimble

TexCal Energy LLC provides oil and gas exploration services. TexCal Energy was acquired by Venoco LLC on March 31, 2006 for $456 million.

Elysium Energy LLC engages in the exploration and development of oil and gas properties. The company is headquartered in Dallas, TX.

Callon Petroleum Co. engages in the exploration, development, acquisition, and production of oil and natural gas properties in the United States. It focuses on unconventional oil and natural gas reserves in the Permian Basin. The company was founded by Sim C. Callon and John S. Callon in 1950 and is headquartered in Houston, TX.

PDC 2002-B LP produces and sells crude oil, natural gas and natural gas liquids. It owns an undivided working interest in wells located in Colorado. The firm is managed by its managing general partner PDC Energy, Inc. The company was founded in 2002 and is headquartered in Denver, CO.

PDC 2002-C LP engages in the exploration and development of crude oil and natural gas properties. It owns an undivided working interest in wells located in Colorado. The company was founded in 2002 and is headquartered in Denver, CO.

Tri-Union Development Corp. provides oil and gas field exploration services. It acquires, develops, explores and produces oil and natural gas properties in core areas. The company is headquartered in Metairie, LA.

Stone Energy Corp. is an independent oil and natural gas company engaged in the acquisition, exploration, exploitation, development and operation of oil and gas properties. It operates in the Gulf of Mexico Basin. The company was founded by James Hiram Stone in 1993 and is headquartered in Lafayette, LA.

Tanda Resources LLC provides oil and gas exploration services. The private company is based in Houston, TX. The company was founded by Sylvia K. Barnes. Sylvia K. Barnes has been the CEO since incorporation.

Crestone Peak Resources LLC operates as an independent energy company focusing on the acquisition, exploration, development, and production of oil and gas reserves in the Rocky Mountain Region. The company was founded on November 16, 2015 and is headquartered in Denver, CO.

The Independent Oil & Gas Association of West Virginia, Inc. was founded in 1959 and engages in the extraction and production of natural gas and oil. The non-profit company is based in Charleston, WV.

The Independent Petroleum Association of America manufactures oil and natural gas. The non-profit company is based in Washington. Barry Russell has been the CEO of the American company since 1980.

American Petroleum Institute (API) is the only national trade association that represents all aspects of America's oil and natural gas industry. Its more than 400 corporate members, from the largest major oil company to the smallest of independents, come from all segments of the industry. They are producers, refiners, suppliers, pipeline operators and marine transporters, as well as service and supply companies that support all segments of the industry.

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.