Sin-Itiro Tomonaga was a Japanese theoretical physicist. He was born in 1906 at Tokyo and died in 1979. He developed the theory of quantum electrodynamics (QED) and developed methods for calculating the interaction between electrons, positrons and photons (as did also Feynman and Schwinger). He graduated from Kyoto University in 1929 and became professor of physics at the University of Tokyo in 1941 and President of the University 1956. In 1965 he was awarded the Nobel Prize for Physics. Research Sin-Itiro Tomonaga