Mark Castiglione

QR Energy LP engages in the acquisition, exploitation, development and production of oil and natural gas properties. Its assets are located in the Permian, Ark-La-Tex, Mid-Continent, Gulf Coast and Michigan regions. The company was founded on September 20, 2010 and is headquartered in Los Angeles, CA.

El Paso Interim Corp. provides natural gas and related energy products in a safe, efficient and dependable manner. The company owns North America's interstate natural gas pipeline systems, which provides a stable base of earnings and cash flow and has a backlog of committed expansion projects. The company operates through three segments: Pipelines, Exploration and Production & Marketing. The Pipelines segment provides natural gas transmission, storage, and related services, primarily in the USA primarily through eight wholly or majority owned interstate pipeline systems and equity interests in two transmission systems. The Exploration and Production segment is engaged in the exploration for and the acquisition, development and production of oil, natural gas and NGL, in the US, Brazil and Egypt. The Marketing segment markets on behalf of its Exploration and Production segment and manages the price risks associated with its oil and natural gas production as well as manages remaining legacy trading portfolio. The company was founded by Paul Kayser in 1928 and is headquartered in Houston, TX.

Burlington Resources, Inc. explored, developed and produced oil and gas. The company is headquartered in Houston, TX.

Quantum Resource Management Engages in oil and gas exploration. The company was founded in June 2006 and is headquartered in Denver, CO.

Part of Maverick Natural Resources LLC, QRE GP LLC provides investment services. The company is based in Houston, TX. QRE GP was acquired by QR Energy LP on March 03, 2014.

Alta Mesa Resources, Inc. is an independent exploration and production company, which is engages in the development of unconventional onshore oil and natural gas reserves. It operates through the following segments: Exploration and Production, Midstream, and Corporate. The Exploration and Production segment sells its production of oil, natural gas, and natural gas liquids (NGL) to customers generally at prevailing spot prices in effect at the time of the sale. The Midstream segment derives its revenue from fees assessed for gathering and processing natural gas, gathering and transporting oil, the sale of processed residue gas and NGLs, and produced water gathering and disposal services. The company was founded in November 2016 and is headquartered in Houston, TX.

Meridian Energy LLC provides energy consulting services. The private company is based in Houston, TX.

Part of Verdun Oil Company II LLC, EP Energy Global LLC is an oil and gas exploration company. The company is based in Houston, TX.

Alta Mesa Holdings LP engages in the acquisition, exploration, development and production of oil, natural gas, and natural gas liquids within the United States. It specializes in engineering analytics and enhanced geological techniques including three-dimensional seismic analysis, and drilling, stimulation, completion, and production methods. The company was founded by Michael E. Ellis in 1987 and is headquartered in Houston, TX.