Sin-Itiro Tomonaga or Shinichirō Tomonaga (朝永 振一郎 Tomonaga Shin'ichirō, March 31, 1906–July 8, 1979) was a Japanese physicist, influential in the development of quantum electrodynamics, work for which he was jointly awarded the Nobel Prize in Physics in 1965 along with Richard Feynman and Julian Schwinger.

Working in Leipzig in the 1930s, he collaborated with Werner Heisenberg's research group. After the Second World War, he worked at the Institute for Advanced Study in Princeton.

External links

• Nobel Prize biography
• Shinichiro Tomonaga