Born on April 16, 1923 to a car mechanic and a teacher in Bromley, Kent, England, he was a good student but gave little indication that he was destined to become a great scientist. He was a mischievous child, having once manufactured a contact explosive that burst when the instructor approached the chalkboard, and he enjoyed experimenting with chemicals. Later, he attended the Sir John Cass Technical Institute and was employed as a technician at Burroughs Wellcome.
He then moved to the Ratcliff Infirmary in Oxford, where he remained from 1940 to 1945. At the same time, he worked as an assistant scoutmaster. He returned to London in 1946 to work as a technician for D. Scott Jones in Harley Street before enrolling in Chelsea Polytechnic, where he obtained an M.B. degree in 1947, and subsequently entered Guy's Medical School shortly thereafter. While at Guy, he was awarded the Golding Bird Prize in Bacteriology and the Leonard Luubock Gold Medal. He earned an M.B. and B.S. from Guy in 1951 and a postgraduate M.D. degree in 1963. He was recruited by Duke University in 1962 as a professor of experimental surgery, where he spent the remainder of his 40-plus year career.