Thomas F. Isler

White Oak Operating Co. LLC explores and produces oil and natural gas. It offers contract drilling and well operation services. Its products include crude oil, natural gas, and petrol. The company was founded in 1998 and is headquartered in Houston, TX.

Hilcorp Energy Co. operates as a oil and natural gas exploration and production company. Its operating areas include the Gulf coast of Texas and Louisiana, the Northeast United States, and Alaska's Cook Inlet and North Slope. The company was founded by Jeffery D. Hildebrand in 1989 and is headquartered in Houston, TX.

Energy Development Corp. engages in the generation of geothermal energy. It operates through the following segments: Leyte Geothermal, Negros Island Geothermal, Bacon-Manito Geothermal, Mt. Apo Geothermal, Pantabangan/Masiway , Wind Business, and Solar Business Facilities; and Others. The Leyte Geothermal segment pertains to Leyte Geothermal Production Field and Power Plants. The Negros Island Geothermal Facility segment refers to Southern Negros Geothermal Production Field and Power Plants. Power plants. The Bacon-Manito Geothermal Facility segment relates to Bacon-Manito Geothermal Production Field and Power Plants. The Mt. Apo Geothermal Facility segment represents Mt. Apo Geothermal Production Field and Power Plants. The Pantabangan/Masiway Facility segment consists of Pantabangan-Masiway hydroelectric complex located in Nueva Ecija Province. The Wind Business Facility segment pertains to wind project commercially operating in Northern Luzon. The Solar Business Facility segment includes solar projects commercially operating in Northern Luzon and Visayas. The Others segment refers to other renewable energy projects including foreign investments and the head office of the company. The company was founded on March 5, 1976 and is headquartered in Pasig, Philippines.

White Oak Resources VI LLC engages in the acquisition of oil and natural gas properties. The company is headquartered in Houston, TX.