Morley Zipursky

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.

The Denver Art Museum operates art galleries and museums. The firm mission is to enrich the lives of present and future generations through acquisition, preservation, and presentation of art works in both the permanent collections and temporary exhibitions, and by supporting these works with educational and scholarly programs. The company was founded in 1949 and is headquartered in Denver, CO.

Rocky Mountain Oil & Gas Association operates a membership-based oil and gas association. The private company is based in Denver, CO.

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.

Nytis Exploration (USA), Inc. operates as a independent oil and gas company that engages in the exploration, development and production of natural gas. It provides oil-field drilling and exploration services. The company was founded in 2004 and is headquartered in Denver, CO.

Nytis Exploration Co. provides gas exploration and production services. The company was founded in 2003 and is headquartered in Denver, CO.

Ellora Energy, Inc. provides oil and gas exploration and production services. It primarily operates in two areas, east Texas and adjacent lands in western Louisiana; and the Hugoton field in southwest Kansas. the company was founded in 1995 and is headquartered in Boulder, CO.

Part of Duke Energy Corp., Associated Natural Gas Corp. is a company that specializes in energy resource development and is a holding company. The company is based in Houston, TX. Associated Natural Gas was acquired by PanEnergy Corp. on December 16, 1994 for $591 million.

NGL TM LLC markets and distributes petroleum products. Its products include unbranded gasoline, diesel fuel, heating oil, marine fuels, jet fuels, crude oil, natural gas, residual fuel oils, chemicals, and fertilizers. The company was founded by Cortlandt S. Dietler in 1981 and is headquartered in Denver, CO.

Poison Spider Oil Co. LLC is a private company that wholesales petroleum products. The company is based in Denver, CO. The company was founded by Cortlandt S. Dietler.