Geophysical Service Incorporated
Geophysical Service Incorporated (often abbreviated GSI) was founded by John Clarence Karcher and Eugene McDermott in 1930 for the purpose of using refraction and reflection seismology to explore for petroleum deposits. It became one of the most successful seismic exploration contractors in the industry for many years. On December 6, 1941, the company was purchased by McDermott, Cecil Howard Green, Erik Jonsson, and H.B. Peacock. During World War II, the company produced submarine detection devices. In 1951, the company was renamed Texas Instruments (TI) with GSI as a division. GSI was later sold by TI, repurchased, and finally sold again to Halliburton in 1988. Halliburton then sold its geophysical business to Western Geophysical in 1994. Western Geophysical was sold to Baker Hughes in 1998 and became part of WesternGeco in 2000.