Career
Education: Werner-Siemens-Realgymnasium, Berlin-Schöneberg. Frederick William University of Berlin. Assistant (1927), Privatdocent in Classics (1932), Frederick William University of Berlin, 1927–1933
Lecturer in Greek Philosophy, University of Rome, 1933–1938
Lecturer in Mediaeval Philosophy (Arabic and Hebrew) (1942), Senior Lecturer in Arabic and Greek Philosophy (1950), Oriel College, Oxford, 1942–1962
Honorary Professor, University of Hamburg, 1952
Member, Institute for Advanced Study, Princeton University, 1953–1954
Fellow, Reader in Arabic and Greek Philosophy Street Catherine"s College, Oxford, 1962–1970
He was elected a Fellow of the British Academy in 1956.