Julian Seymour Schwinger (/ˈʃwɪŋər/; February 12, 1918 – July 16, 1994) was a Nobel Prize winning American theoretical physicist. He is best known for his work on the theory of quantum electrodynamics (QED), in particular for developing a relativistically invariant perturbation theory, and for renormalizing QED to one loop order. Schwinger was a physics professor at several universities.

Julian Schwinger
Born	Julian Seymour Schwinger February 12, 1918 New York City, New York, U.S.
Died	July 16, 1994(aged 76) Los Angeles, California, U.S.
Nationality	United States
Alma mater	City College of New York Columbia University
Known for	Quantum electrodynamics Spin–statistics theorem Sigma model MacMahon Master theorem List of things named after Julian Schwinger
Spouse(s)	Clarice Carrol (m. 1947)
Awards	Albert Einstein Award(1951) National Medal of Science (1964) Nobel Prize in Physics (1965)
Scientific career
Fields	Physics
Institutions	University of California, Berkeley Purdue University Massachusetts Institute of Technology Harvard University University of California, Los Angeles
Doctoral advisor	Isidor Isaac Rabi
Doctoral students	Roy Glauber Ben R. Mottelson Sheldon Lee Glashow Walter Kohn Bryce DeWitt Daniel Kleitman Sam Edwards Gordon Baym Lowell S. Brown Stanley Deser Lawrence Paul Horwitz Margaret G. Kivelson Tung-Mow Yan

Julian Schwinger, winner of the 1965 Nobel Prize in Physics. Original caption: “His laboratory is his ballpoint pen.”

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 electroweakmodel, 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.

https://en.wikipedia.org/wiki/Julian_Schwinger