David M. Demshur

Society of Petroleum Engineers, Inc. provides petroleum engineering services. The non-profit company is based in Allen, TX and has subsidiaries in United States, India and Canada.

Owen Oil Tools LP provides well-completion and well-perforating products. The company was founded in 1983 and is headquartered in Godley, TX.

Core Laboratories NV engages in the provision of proprietary and patented reservoir description, production enhancement, and reservoir management services to the oil and gas industry. It operates through the Reservoir Description segment and Production Enhancement segment. The Reservoir Description segment encompasses the characterization of petroleum reservoir rock, fluid, and gas samples and provides analytical and field services to characterize properties of crude oil and petroleum products. The Production Enhancement segment provides products and services relating to reservoir well completions, perforations, stimulations, and production. The company was founded in 1936 and is headquartered in Amsterdam, the Netherlands.