Mark A. DePuy

Unocal Corp. explores, develops, produces, and markets crude oil and natural gas. The firm also produces geothermal energy in Indonesia and the Philippines and makes petroleum coke, graphite's and silicon carbide materials. The company was founded on October 17, 1890 and is headquartered in El Segundo, CA.

Venoco Acquisition Co. LP acquires, exploits, develops and produces oil and natural gas properties. The company's properties are primarily located in coastal California and onshore Texas. The company had an average working interest of 38.5% in 325 gross producing wells as of September 30, 2007. Venoco Acquisition Co. GP LLC and Venoco, Inc. provide management and administrative services to the company. Venoco Acquisition Co. LP was formed by Venoco, Inc. in September 2007 and is headquartered in Denver, CO.

Venoco LLC engages in the acquisition, exploration, and development of oil & natural gas properties. Its principal producing assets are heavily oil-weighted and are located both onshore and offshore in Southern California. The company was founded by Timothy M. Marquez in September 1992 and is headquartered in Denver, CO.

Great Western Operating Co. LLC engages in exploration and production of oil and natural gas. Its operation is located in Denver Julesburg Basin, Colorado. The company was founded in 2005 and is headquartered in Denver, CO.

Denver Parent Corp. operates as a holding company. It engages in the acquisition, exploration, exploitation and development of oil and natural gas properties. The company was founded in January 2012 and is headquartered in Denver, CO.