John Bardeen
The development of transistor technology has been fundamental to modern electronic telecommunication. Julius Edgar Lilienfeld proposed the concept of a field-effect transistor in 1926, but it was not possible to actually construct a working device at that time. The first working transistor, a point-contact transistor, was invented by John Bardeen and Walter Houser Brattain while working under William Shockley at Bell Labs in 1947.