Manuel Treviño

Computalog Ltd. provides open hole logging services and equipment. The company is headquartered in Calgary, Canada.

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.

Ovintiv Canada ULC engages in the production of natural gas, oil and natural gas liquids. It operates through the following segments: Canadian Operations, USA Operations and Market Optimization. The Canadian Operations segment includes the exploration for, development of and production of natural gas, oil and natural gas liquids and other related activities within Canada. The USA Operations segment involves in the exploration, development and production of natural gas, oil, and natural gas liquids and other related activities within the U.S. The Market Optimization segment is responsible for the sale of the company's proprietary production to third party customers and the associated netback price. The company was founded in 1881 and is headquartered in Calgary, Canada.

Part of Nabors Industries Ltd., Enserco Energy Service Co., Inc. provides production and drilling services to the oil and gas industry. The company is based in Calgary, Canada. The Canadian company was founded in 1988 by Walter Alfred Dawson. Enserco Energy Service Co. was acquired by Nabors Industries Ltd. on April 30, 2002 for $216 million.

VGS Database International, Inc. provides seismic data creation services for the oil and gas industry. The firm offers seismic support and other interpretation services. The company is located in Calgary, Canada

Petróleos de Venezuela SA is a gas and oil company. It is engaged in exploring, extracting, transporting, manufacturing, refining, storing, and marketing crude oil and other hydrocarbons. The company was founded in 1975 and is headquartered in Caracas, Venezuela.

Part of Saxon Energy Services, Inc., Saxon Drilling Canada LP is a Canadian company that provides contract drilling and related services to oil and gas companies. The company is based in Calgary, Canada.

University of Houston System offers higher education degrees and job training or vocational study programs. It offers about 280 undergraduate and graduate degree programs in fields such as business, education, humanities and law. It was founded in 1927 and is headquartered in Houston, TX.

Arequipa Resources Ltd. is a Canadian mineral exploration company. The private company is based in Vancouver, Canada. The company was founded by Catherine McLeod-Seltzer and Mark Edward Jones.

Saxon Energy Services Inc. provides contract land drilling services. The company was founded in 2005 and is headquartered in Calgary, Canada.

PDVSA Gas SA engages in gas production and exploration services. The company is based in Caracas, Venezuela. The Venezuelan company is a subsidiary of Petróleos de Venezuela S.A. (PDVSA) and ultimately controlled by the Government of Venezuela.

Centro Internacional de Educación y Desarrollo is a company based in Caracas, Venezuela. The Venezuelan company develops and provides educational services. The company is ultimately controlled by the Government of Venezuela.

Inepetrol SA provides support activities for oil and gas operations. The private company is based in Apartado, Venezuela.