Robert L. Hargrave

Stewart & Stevenson LLC designs, manufactures and markets oil and gas equipment. It offers products and services to a variety of industries such as agriculture, construction and industrial, marine, material handling, military and government, mining, oil and gas, on-highway and transportation, power generation, and rail. The company was founded in 1902 and is headquartered in Houston, TX.

IRI International Corp. manufactures land-based drilling and well-servicing rigs and rig component parts. It designs manufactures, sales and lessees onshore and offshore oilfield equipment for the domestic and international markets. The company is headquartered in Houston, TX

Stewart & Stevenson Services, Inc. is a manufacturer and marketer of specialized equipment and provider of aftermarket parts and service to the oil and gas and other industries. The company's product offerings include equipment for well stimulation, well workover and service, drilling, coiled tubing, cementing, nitrogen pumping, power generation and electrical systems as well as engines, transmissions and material handling equipment. Stewart & Stevenson was founded in 1902 and is headquartered in Houston, TX.