Glashow, Sheldon Lee (1932- )

US particle physicist. In 1964 he proposed the existence of a fourth, 'charmed' quark, and later argued that quarks must be coloured. Insights gained from these theoretical studies enabled Glashow to consider ways in which the weak nuclear force and the electromagnetic force (two of the fundamental forces of nature) could be unified as a single force now called the electroweak force. For this work he shared the Nobel Prize for Physics 1979 with Abdus Salam and Steven Weinberg.
Glashow was born in New York and studied at Cornell and Harvard universities. He worked at the Niels Bohr Institute in Copenhagen before becoming professor at Harvard 1967.