John Bradley Fisher

Carrizo Oil & Gas, Inc. engaged in the exploration, development, and production of natural gas and oil. Its operations included Delaware Basin and Eagle Ford Shale. The company was founded by Sylvester P. Johnson IV and Steven Alan Webster in December 1993 and was headquartered in Houston, TX.

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.

Cody Energy, Inc. extracts crude petroleum and natural gas. The private company is based in Denver, CO.

Part of Chromadex Corp., Ultramar Oil & Gas Ltd is an American company that specializes in oil and gas production. Ultramar Oil & Gas was acquired by Cody Resources, Inc. from ENI Lasmo Plc on September 14, 1992 for $85 million.

Rosehill Resources, Inc. engages in the production of oil and natural gas. It focuses on the acquisition, exploration, and development of unconventional oil and associated liquids-rich natural gas reserves in the Permian Basin. The company was founded on September 21, 2015 and is headquartered in Houston, TX.