In 1957 he joined the School of Tropical Medicine at the University of Edinburgh .
In 1957 he then became senior lecturer in the Department of Veterinary Medicine , University of Bristol , where he taught clinical pathology and the microbiology of infectious diseases .
In 1957 he joined the School of Tropical Medicine at the University of Edinburgh and then became senior lecturer in the Department of Veterinary Medicine , University of Bristol , where he taught clinical pathology and the microbiology of infectious diseases .