Weatherford is one of the largest international oil and natural gas service companies. The company provides products and services for drilling, evaluation, completion, production and intervention of oil and natural gas wells, along with pipeline construction and commissioning. Headquartered in Switzerland, Weatherford operates in more than 100 countries across the globe and employs more than 60,000 people. The company was founded in 1941 in Weatherford, Texas as the Weatherford Spring Company by Jesse E. Hall Sr. In 1948, the company was renamed Weatherford Oil Tool Company (WOTCO) with ownership by Jesse Hall, his son, Elmer, James E. Berry, and Juan A. Perea. From its inception, the company pioneered an innovative technique and equipment for the cementing of cased-hole oil wells. Originally marketed to U.S. well owners, Weatherford drilling and casing equipment was soon being used in the oil fields of Venezuela by the Gulf Oil Company. In 1972, the separate company of Energy Ventures, Inc. was founded as an offshore gas and oil exploration and production company. In 1987, Energy Ventures was liquidated and re-established, and by 1990, had acquired Grant Oil Country Tubular Company.