Mark E. Rueff

ONEOK Energy Services Co. LP provides physical and financial energy products and services. It operates power plants generating capacity and trades petroleum products. The company is headquartered in Tulsa, OK.

Chevron USA, Inc. provides petroleum refining services and operates gasoline stations. It produces and transports crude oil and natural gas. The company was founded in 1984 and is headquartered in San Ramon, CA.

Columbia Gas System, Inc. distributes and sells natural gas. The private company is based in Wilmington, DE and has subsidiaries in the United States.

Southern Methodist University is a private university near the center of Dallas, SMU offers undergraduate, graduate, and professional programs through seven schools in the humanities and sciences, business, the performing, visual, and communication arts, engineering, education and human development, law, and theology.

Superior Natural Gas Corp. sells natural gas and propane products & provides support services. The company was founded by John W. Croft, Jr. and is headquartered in Houston, TX.

Western Gas Resources, Inc. used to explore natural gas and natural gas liquids. It engaged in the exploration, development, production, gathering, processing, treatment, transportation and marketing of natural gas and natural gas liquids. It operated through four segments: Gas Gathering, Processing and Treating, Exploration and Production, Marketing and Transportation. Western Gas Resources, Inc. was founded in 1989 and was headquartered in Denver, CO.

American Electric Power Service Corp. provides management and engineering solutions. It offers engineering, technical, and drafting services. The company was founded in 1937 and is headquartered in Columbus, OH.

American Business Products, Inc. provides custom printing and packaging services. Its products include custom-printed envelopes, labels, digital document services and business forms. The company is headquartered in Atlanta, GA.

Shell Deer Park Refining Co. is a joint venture company that manufactures oil refineries. The company is based in Deer Park, TX.

CITGO Petroleum Corp. engages in refining, transporting, and marketing of transportation fuels, lubricants, and petrochemicals products. It offers retail gasoline, diesel fuel, jet fuel, lubricants, petrochemicals, and other petroleum-based industrial products. The company was founded by Henry L. Doherty in 1910 and is headquartered in Houston, TX.

Marklund Children's Home provides healthcare services. The company was founded in 1975 and is headquartered in Geneva, IL.

Summit was founded in 1991 to provide customers with unbiased, independent and professional energy management services. The company began as a small operation in Louisville, Kentucky, USA focused on gas strategies. It quickly added electricity and alternative fuels to its growing list of services, and it began attracting leading financial and energy professionals in the energy industry. Today, Summit is comprised of more than 300 energy professionals in ten international offices managing nearly $20 billion in annualized global energy spend. Its clients include global Fortune 1000-sized companies, as well as diverse regional companies that leverage its energy industry-leading experience. Its global energy management services include energy procurement, energy risk management and utility consulting. Crude oil forecasting and natural gas hedging also are among its core services. Summit is focused on helping clients capitalize on opportunities and implement a strategic approach to energy risk management.

Mobil Corp. operates primarily in the petroleum industry. The company is headquartered in The Woodlands, TX.

El Paso Marketing LP (El Paso Merchant Energy) provides wholesale trading of natural gas, crude oil, electricity and other commodities. It also markets asset-based commodities. The firm also sells the unit's petroleum refining, coal mining, chemical production and LNG transportation operations. The company is headquartered in Houston, TX.

Shell Oil Products Co. LLC produces and markets oil and natural gas. The firm refines, markets, and distributes crude oil and petroleum products. The company was founded in 1912 and is headquartered in Dallas, TX.

Part of Kinder Morgan, Inc., Coastal Gas Marketing Co. is an American company that distributes gas.

Tennessee Gas Pipeline Co. LLC provides transportation and storage of natural gas. It engages in its business activities through natural gas pipeline system and storage facilities. The firm provides services to the natural gas distribution, electric generation, natural gas producers, other natural gas pipelines, natural gas marketing and trading companies. The company was founded on June 9, 1947 and is headquartered in Austin, TX.

Part of ageas SA/NV, Cinergy Marketing & Trading LP is a company that provides physical, financial, and risk management services to natural gas producers and consumers. The company is based in Houston, TX. Cinergy Marketing & Trading was acquired by ageas SA/NV from Duke Energy Corp. on October 02, 2006.