Kahn was born in London on 10 August 1905, and died in Cambridge on 6 June 1989. His father, Augustus Kahn, had been born in England of German parents; he Read mathematics at St John's College, Cambridge, and became a schoolmaster and later an inspector of schools. Kahn's mother was born Regina Schoyer in Germany. The family were orthodox Jews, and Kahn and his three younger sisters were brought up in an environment which combined strict observance of the laws of the Torah with a commitment to education, culture and public service.
From The Biographical Dictionary of British Economists in Oxford Reference.