David Roland

ION Geophysical Corp. engages in the provision of geoscience technology, services, and solutions to the oil and gas industry. It operates through the E&P Technology and Services, and Operations Optimization segments. The E&P Technology and Services segment creates digital data assets and delivers services that improve decision-making, mitigate risk and maximize portfolio value for E&P companies. The Operations Optimization segment develops mission-critical subscription offerings and engineering services that enable operational control and optimization offshore. The company was founded in 1968 and is headquartered in Houston, TX.

Enron Corp. provides energy related services

Caltex Oil Corp provides oil drilling services and operates gas stations.

Part of Diamond Offshore Drilling, Inc., Diamond Offshore Ltd. provides contract offshore drilling services. The company is based in London, UK. Diamond Offshore was founded in 1968.

Founded in 2008, Diamond Rig Investments Ltd. is a British company that engages in the charter of offshore drilling units. Part of Diamond Offshore Drilling, Inc., the company is based in London, UK.

Part of Diamond Offshore Drilling, Inc., Diamond Foreign Asset Co. provides oil and gas well drilling services.

Founded in 2008, Diamond Offshore Enterprises Ltd. is a holding British company that operates subsidiaries which specialize in offshore drilling rigs. The company is based in London, UK and is a part of Diamond Offshore Drilling, Inc.