He was research fellow in paediatrics in Ibadan and Lagos in Nigeria from 1962 to 1965, and lecturer in social medicine at St Thomas's Hospital Medical School in London from 1966 to 1968.
He was a research fellow in pediatrics in Ibadan and Lagos, Nigeria from 1962 to 1965, and an instructor in social medicine at St Thomas's Hospital Medical School in London from 1966 to 1968.