Steven Weinberg was an American theoretical physicist who, in 1967, independently of Pakistani physicist Abdus Salam, proposed a theory, known as the electroweak theory, that unifies the electromagnetic and weak interactions between subatomic particles. Later experiments proved the Salam-Weinberg theory to be true. In 1979 they shared the Nobel Prize in Physics with Sheldon Glashow, who had earlier proposed a similar theory. Weinberg holds the Josey Regental Chair in Science at the University of Texas at Austin.