Robert W. Shain

Frontier Energy Services LLC operates a midstream energy firm. Its services include gathering, compression, processing, and treating facilities, and the marketing of natural gas and natural gas liquids. The company was founded by Dave Presley in 2002 and is headquartered in Tulsa, OK.

Part of Enbridge, Inc., CMS Field Services, Inc. gathers, processes, transports and markets natural gas and natural gas liquids. The company is based in Tulsa, OK. CMS Field Services was acquired by Cantera Resources, Inc. from CMS Energy Corp. on July 02, 2003 for $162.60 million.

Hiland Partners LP is a midstream energy partnership engaged in purchasing, gathering, compressing, dehydrating, treating, processing and marketing natural gas and the fractionating, or separating, and marketing natural gas liquids. Hiland Partners also provides air compression and water injection services to Continental Resources, Inc., a publicly traded exploration and production company controlled by affiliates of Hiland Partners' general partner for use in its oil and gas secondary recovery operations. The company's operations are primarily located in the Mid-Continent and Rocky Mountain regions of the United States. In the Partnership's midstream segment, it connects the wells of natural gas and crude oil producers in its operating areas to its gathering systems, treats natural gas to remove impurities, processes natural gas for the removal of NGLs, fractionates NGLs into NGL products and provides an aggregate supply of natural gas and NGL products to a variety of transmission pipelines and markets. The company is headquartered in Enid, OK.