Julian Seymour Schwinger
1918–1994, New York City, USA, Los Angeles, California, USA
American theoretical physicist who completed the renormalized quantum electrodynamics and computed the electron's anomalous magnetic moment; co-recipient of the 1965 Nobel Prize.
A prodigy who published his first paper at sixteen and earned his doctorate under I. I. Rabi, Schwinger applied wartime waveguide mathematics to quantum fields. His Green's-function formalism, developed in 1947–49, produced the first precision prediction of QED — the correction α/2π to the electron's magnetic moment — and he later pioneered source theory and effective field theory.
Nobel-winning work
The 1965 Nobel Prize cited Schwinger's fundamental work in quantum electrodynamics. Between 1947 and 1951 he developed a systematic covariant formalism — relativistic Green's functions, proper-time methods and the quantum action principle — that made radiative corrections calculable.
His calculation of the electron's anomalous magnetic moment, g-2 = α/π, agreed with precision measurements and proved that the infinities plaguing QED could be consistently removed by renormalization, turning the theory into the archetype of all subsequent gauge theories.
Workplaces: Harvard University, University of California, Los Angeles
United States