Parker Drilling Co. is a holding company, engages in the provision of contract drilling and drilling-related services as well as rental tools and services. It operates through the Drilling Services and Rental Tools Services segments. The Drilling Services segment drills oil, natural gas, and geothermal wells for customers globally. The Rental Tools Services segment provides rental equipment and services to exploration and production companies, drilling contractors, and service companies on land and offshore in the U.S. and select international markets. The company was founded by Gifford C. Parker in 1934 and is headquartered in Houston, TX.