Marc Kevin Fisher

CARBO Ceramics, Inc. is an oilfield services technology company. The firm manufactures and supplies ceramic proppant and resin-coated sand. It operates through the following segments: Oilfield and Industrial Technologies and Services; and Environmental Technologies and Services. The Oilfield and Industrial Technologies and Services segment manufactures and sells ceramic technology products and services, base ceramic proppant and frac sand for both the oilfield and industrial sectors. The Environmental Technologies and Services segment intends to protect operator?s assets and minimize environmental risks and lower lease operating expense. The company was founded in 1987 and is headquartered in Houston, TX.

Pinnacle Technologies, Inc. provides engineering, oil fracturing, and other oil and gas related services. It offers surface and downhole micro seismic monitoring, as well as surface and downhole micro deformation analysis. The company was founded in 1992 and is headquartered in Houston, TX.

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.

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.

Liberty Oilfield Services LLC engages in the provision of oilfield services. Its services include stimulation and engineering services and equipment rentals. The company was founded in March 2011 and is headquartered in Denver, CO.

Proppant Express Solutions LLC engages in the provision of sand storage and logistics services. The company is headquartered in Denver, CO.