Dean A. Burkhardt

Pioneer Energy Services LLC. engages in the provision of land-based drilling services and production services to oil and gas exploration and production companies. It operates through Drilling and Production Services segments. The Drilling Services segment offers drilling rig, crews, supplies, and most of the ancillary equipment needed to operate drilling rigs. The Production Services segment offers well servicing,wireline and coiled tubing services to producers primarily in Texas and the Mid-Continent and Rocky Mountain regions, as well as in North Dakota, Louisiana and Mississippi. The company was founded in 1968 and is headquartered in San Antonio, TX.

Frontera Resources Corp. operates as an oil & gas exploration and production company. It focuses on the exploration and development of oilfields within the Republic of Georgia, Ukraine and Moldova. The company was founded by Steve C. Nicandros and Zaza Mamulaishvili in 1996 and is headquartered in Houston, TX.

Dubina Rose Ranch Ltd. focuses on producing elite registered grey Brahman cattle and making continued progress. It performance oriented program is built on production records, proven genetics, progeny testing, carcass ultrasound, sexed semen, AI and IVF. The company was founded in 2006 and is headquartered in Schulenburg, TX.

Part of Cooperativa de Telefonos Automaticos La Paz, Tescorp, Inc. is an American company that specializes in creating unique compressor system solutions for specific oil field and gas needs. The company is based in Oklahoma and has been in business for over 35 years. The company's primary product, the TESCORP "BVR-MODULAR 1" Series, is a self-contained compression system used for stock tank vapor recovery, flare gas recovery, or small flow, medium pressure process gas applications. Tescorp was acquired by SuperCanal Holding SA, part of Cooperativa de Telefonos Automaticos La Paz from March 07, 2007 on March 31, 1998 for $59.35 million.

Part of Nabors Industries Ltd., Cheyenne Services, Inc. manufactures, provides, and rents tools, machinery, and services to the oil and gas field industry. The company is based in Houston, TX. The company was founded by Dean A. Burkhardt. Cheyenne Services was acquired by Tesco Corp. on November 02, 2005.