Krebs's life as a reputed German scientist came to an abrupt halt because of his Jewish ancestry. With the rise of Hitler's Nazi Party to power, Germany decreed the Law for the Restoration of the Professional Civil Service (the removal of all non-Aryans and anti-Nazis from professional occupations). Krebs received official dismissal from his job in April 1933, and his Service was terminated on 1 July. An admirer, Sir Frederick Gowland Hopkins at the University of Cambridge, immediately came to his rescue and persuaded the university to recruit Krebs to work with him in the Department of Biochemistry. By July 1933 he settled in Cambridge with financial support from the Rockefeller Foundation. Although he was restricted to bring only his personal belongings, he was fortunate to be allowed to take his equipment and research samples to England, as they proved to be pivotal to his later discoveries, especially the manometer developed by Warburg specifically for the measurement of oxygen consumption in thin slices of tissues; it was the basis for his research. He was appointed as Demonstrator in biochemistry in 1934 and in 1935 the University of Sheffield offered him a post of Lecturer in Pharmacology, with a more spacious laboratory and double the salary; he worked there for 19 years. University of Sheffield opened a Department of Biochemistry (now Department of Molecular Biology and Biotechnology) in 1938 and Krebs became its first Head, and eventually Professor in 1945. Krebs took over the running of the Sorby Research Institute in 1943. In 1944, the British Medical Research Council established the MRC Unit for Cell Metabolism Research at Sheffield, and Krebs was appointed as the Director. With this his laboratory became so expanded that the locals jokingly nicknamed it "Krebs's Empire". He moved with his MRC unit to the University of Oxford in 1954 as Whitley Professor of Biochemistry, the post he held till his retirement in 1967. The editorial board of Biochemical Journal extended their good wishes on his retirement, but in return he promised to keep them busy (by producing scientific papers). He continued research and took his MRC unit to the Nuffield Department of Clinical Medicine at the Radcliffe Infirmary, Oxford. From there he published over 100 research papers.