D. Ronald Harrell

eCORP International LLC develops shale gas reserves and natural gas storage facilities. The private company is based in Houston, TX.

Ryder Scott Co. LP is an oil and gas engineering and geological consulting company based in Houston, TX with subsidiaries in the United States. The private company performs enhanced recovery studies, feasibility reports, fluid injection project designs, horizontal drilling studies, and evaluates oil and gas properties. The company also provides expert witness testimony and technical research & analysis to assist in the preparation of legal cases. Ryder Scott's mission is to provide independent and expert guidance to their clients with the utmost professionalism and integrity, while their vision is to be the preferred oil and gas engineering and geological consultants, known worldwide for quality, reliability, and integrity.

The Carlyle Group LP (Global Credit) (Carlyle Group), subsidiary of The Carlyle Group Inc. is a private equity firm founded in 1987 by William E. Conway Jr., Daniel A. D'Aniello and David M. Rubenstein. The firm is headquartered in Washington, DC with offices in North America, South America, Europe, the Middle East, Africa, Asia and Australia.

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.

Union Drilling, Inc. was provided contract land drilling services and equipment to oil and natural gas producers in the United States. It provided drilling services primarily to major or independent oil and natural gas producers that operate in the exploration and productions areas in the United States. The firm specialized in shallow to deep horizontal drilling in select oil and gas producing basins of the United States. The company was founded in December 1997 and was headquartered in Fort Worth, TX.