Southeast Asia Treaty Organization
From 1951 to 1960, he worked for West African Institute for Trypanosomiasis Research in Vom, Nigeria. In 1960, he joined the University of Malaya in Singapore as Professor of Parasitology, where he worked until 1965. He then worked as Chief of the Southeast Asia Treaty Organization Laboratory's Department of Parasitology in Bangkok from 1965 to 1968. While working there, he spent time doing research in Papua New Guinea.