German born British Bio chemist pioneered work on the chemical processes
involved in metabolism. In 1937 he discovered Kreb's cycle, the process in
which the body cells convert food into energy. For this he shared the Nobel
prize for physiology/ medicine in 1953 with the US Bio chemist Fritz
Lipmann(1899-1986). He also discovered the urea cycle, the key chemical
process involved in excretion. In 1958 he was honored with a knight hood.