Frederick Sanger
In the early 1950s, he taught at the Ibadan University medical school, researching topical malnutrition, before returning to Cambridge in 1954. In 1957, he was named the first black African Fellow of a Christ's College, and went to the college to research insulin under famed scientist Frederick Sanger. He published two works on the topic, "The Mechanism of Action of Insulin" and "The Structure of Human Insulin." both in 1960. He had returned to Freetown in 1958, and was working for the Sierra Leonean government as a pathologist.