Parker Drilling Co. engages in the provision of contract drilling and drilling-related services. It operates under the Drilling Services and Rental Tools Services segments. The Drilling Services segment is involved in drilling oil, natural gas, and geothermal wells. The Rental Tools Services segment offers rental equipment and services to exploration and production companies, drilling contractors, and service companies on land, offshore, and selected markets. The company was founded by Gifford C. Parker in 1934 and is headquartered in Houston, TX.