Julian Seymour Schwinger was an American theoretical physicist. He is best known for his work on the theory of quantum electrodynamics , in particular for developing a relativistically invariant perturbation theory, and for renormalizing QED to one loop order. Schwinger is recognized as one of the greatest physicists of the twentieth century, responsible for much of modern quantum field theory, including a variational approach, and the equations of motion for quantum fields. He developed the first electroweak model, and the first example of confinement in 1+1 dimensions. He is responsible... for the theory of multiple neutrinos, Schwinger terms, and the theory of the spin 3/2 field. Julian Seymour Schwinger was born in New York City, to a Polish Jewish family, who had immigrated to America. Both his father and his mother's parents were prosperous clothing manufacturers, although the family business declined after the 1929 Wall Street Crash. The family followed the Orthodox Jewish tradition.
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