John Bardeen Biography

John Bardeen (/bɑːrˈdiːn/; May 23, 1908 – January 30, 1991) was an American physicist and electrical engineer. He is the only person who won the Nobel Prize in Physics twice: first in 1956 with William Shockley and Walter Brattain for the invention of the transistor; and again in 1972 with Leon N Cooper and John Robert Schrieffer for a fundamental theory of conventional superconductivity known as the BCS theory.