William Berry

Willbros Group, Inc. engages in the provision of engineering and construction services to the oil, gas, refinery, petrochemical, and power industries. The company was founded by Miller Williams and David Williams in 1908 and is headquartered in Houston, TX.

CNOOC Petroleum North America ULC is an upstream oil and gas company responsibly developing energy resources in the UK North Sea, offshore West Africa, the United States, and Western Canada. The firm has three principal businesses: conventional oil and gas, oil sans, and gas and oil. The company was founded in 1971 and is headquartered in Calgary, Canada.

Continental Resources, Inc. is an independent oil producer engaged in the exploration, development, and production of crude oil and natural gas. The firm's operations include horizontal drilling and protecting groundwater. The company was founded by Harold G. Hamm in 1967 and is headquartered in Oklahoma City, OK.

Williams Partners LP owns, operates, develops & acquires natural gas gathering system and energy assets. It focuses on natural gas gathering, the first segment of midstream energy infrastructure that connects natural gas produced at the wellhead to third-party takeaway pipelines. The company was founded in 2005 and is headquartered in Tulsa, OK.

Frank's International NV engages in the provision of tubular services to oil and gas industries. It operates through the following four segments: Tubular Running Services, Tubulars and Cementing Equipment. The Tubular Running Services segment provides tubular services in international offshore markets and in several onshore international regions. The Tubulars segment designs, manufactures, and distributes large outside diameter (OD) pipe, connectors, casing attachments and sells large OD pipe originally manufactured by various pipe mills. The Cementing Equipment segment provides equipment to enhance the safety and efficiency of rig operations. The company was founded by Frank Mosing in 1938 and is headquartered in Den Helder, Netherlands.