The father of the transistor is
John Bardeen. He, along with
Walter Brattain and
William Shockley, co-invented the transistor in 1947 at Bell Labs. John Bardeen and Walter Brattain are credited with the actual invention of the point-contact transistor, while William Shockley contributed to the development of the more widely used junction transistor.
John Bardeen later went on to win two Nobel Prizes in Physics — one for the invention of the transistor (1956) and the other for the theory of superconductivity (1972).