John Davidson Ketchum (1893–1962) was a Canadian psychologist, author, and professor at the University of Toronto.
He recalled that the prisoners were "almost a cross-section of British society, from the manor house to the slum; scarcely a trade or profession was unrepresented.
All were jammed together in a small stableyard—company directors and seamen, concert musicians and factory workers, science professors and jockeys.
Few had ever met previously; their only common bond was their British citizenship" (Ketchum, p. 2).
[2] The department of psychology at the University of Toronto awards annually the J. Davidson Ketchum Graduate Award and Graduate Scholarship, which were established by his children, Dr. Edward J.D.