Texas Instruments
In 1930, J. Clarence Karcher and Eugene McDermott founded Geophysical Service, an early provider of seismic exploration services to the petroleum industry. In 1939, the company reorganized as Coronado Corp., an oil company with Geophysical Service Inc (GSI), now as a subsidiary. On December 6, 1941, McDermott along with three other GSI employees, J. Erik Jonsson, Cecil H. Green, and H.B. Peacock purchased GSI. During World War II, GSI expanded their services to include electronics for the U.S. Army, Signal Corps, and the U.S. Navy. In 1951, the company changed its name to Texas Instruments, with GSI becoming a wholly owned subsidiary of the new company.
Morris Tanenbaum
In the meantime, Gordon Teal had moved to Texas Instruments, where he was essential to the organization of TI's research department. He also led its team of silicon transistor researchers. On April 14, 1954 he and Willis Adcock successfully tested and demonstrated the first grown-junction silicon transistor. Like Tanenbaum, they used highly purified DuPont silicon. Teal was able to bring the silicon transistor to production. He announced the results and displayed the TI transistors on May 10, 1954 at the Institute of Radio Engineers (IRE) National Conference on Airborne Electronics, in Dayton, Ohio.