J. Darby Seré

Howell Corp. explores, produces, and acquires oil and gas properties. The firm's exploration and production activities are conducted by its wholly owned subsidiary, Howell Petroleum Corporation. The company was founded by Paul Neilso in 1955 and is headquartered in Houston, TX.

Gateway Energy Corp. is engaged in the midstream energy business. It owns and operates natural gas distribution, transmission and gathering pipeline systems located onshore in the continental United States and offshore in the federal and state waters of the Gulf of Mexico. Gateway Energy pipelines serves industrial facilities, power generation facilities and municipal city gates. It gathers offshore wellhead natural gas production and liquid hydrocarbons and then aggregates this production for transportation to other pipelines. Gateway also transports natural gas through its onshore systems for non-affiliated shippers, and distributes natural gas from company-owned facilities to end users. The company was founded in 1960 and is headquartered in Houston, TX.

GeoMet, Inc. is an independent energy company, which engages in the exploration, development, and production of natural gas from coal seams and non-conventional shallow gas. It also controls non-producing coal-bed methane and oil and gas development rights. The company was founded by Brett S. Camp in 1985 and is headquartered in Austin, TX.

Ciris Energy, Inc. develops and produces energy from abundant, low-value carbon sources. Its services include the science, the process and intellectual property. It's commercializes proprietary biotechnology for the conversion of fossil sources of carbon, such as low rank coal, to natural gas and other valuable chemicals on a large scale. The firm has locations in Australia, Brisbane, Colorado and Wyoming. The company was founded by Robert A. Downey in 2007 and is headquartered in Centennial, CO.

Part of Occidental Petroleum Corp., Howell Petroleum Corp. is a company based in Midwest, WY.