The German-British biochemist Sir Hans Adolf Krebs (1900-1981) shared the Nobel Prize in Physiology or Medicine for his discovery of the citric, or tricarboxylic, acid cycle (Krebs cycle).

Hans A. Krebs, the son of Georg Krebs, an otolaryngologist, was born in Hildesheim, Germany, on April 25, 1900. He studied medicine at the universities of Göttingen, Freiburg im Breisgau, Munich, and Berlin, qualified in 1924, and in 1925 graduated as a doctor of medicine in the University of Hamburg. After a year's study of chemistry in Berlin, he was assistant to the biochemist Otto Warburg in Berlin-Dahlem from 1926 to 1930. Krebs then returned to university clinical work, first at Altona and then as assistant at the University Medical Clinic in Freiburg. In June of 1933 the Nazis terminated his appointment, and Sir Frederick Gowland Hopkins invited him to work, with a Rockefeller studentship, at the Biochemical Institute at Cambridge. In 1934 Krebs was appointed...