W.D. von Gonten Engineering LLC

Founded in 1937, Ryder Scott Petroleum Consultants evaluates oil and gas properties and independently certifies petroleum reserve quantities. The firm performs several hundred consulting studies per year for a variety of clients, including those preparing annual petroleum reserve certifications for filers with the United States Securities and Exchange Commission, as well as clients listed on the London, Ontario, Toronto, Hong Kong and Australian stock exchanges. With more than 60 professional petroleum engineers and geoscientists, the firm conducts reserves evaluations, geoscience and geology studies, field development and enhanced oil recovery design, reservoir simulation, economic analysis, management consulting and expert witness testimony. It also provides a complete range of professional engineering, geoscientific and economic evaluation services. The Houston-based firm has branch offices in Calgary and Denver.

Southwestern Energy Company, founded in 1929, explores, produces and distributes natural gas and oil throughout the United States, including Arkansas, Texas, Louisiana, New Mexico, and Oklahoma. The company conducts its exploration and production activities through its wholly owned subsidiaries, Southwestern Energy Production Company and SEECO. It has oil drilling operations in the Arkoma Basin and East Texas, and exploration facilities in New Mexico. The company s subsidiary, Arkansas Western Gas Company, distributes and transmits natural gas to more than 1 million residential, commercial and industrial customers in northern Arkansas. It also provides natural gas storage and transportation facilities to third-party clients. Southwestern Energy Company is headquartered in Houston.

Founded in 1964, Oceaneering International provides engineered services and products for the offshore oil and gas, defense and aerospace industries. It specializes in deepwater applications. The company offers remote-operated vehicles, mobile offshore production systems and built-to-order specialty subsea hardware. It provides nondestructive testing and inspection, engineering and project management, subsea intervention and installation and manned diving services. The company offers training programs on remotely operated vehicles for pilots, technicians and supervisors. It has a more than 7,500-square-foot training facility that includes a classroom, laboratory and administrative office. With annual revenues of more than $436 million, Oceaneering International maintains a presence in Texas.