Leon S. Robertson returned to the Yale University faculty in 2018 as Professor Adjunct after retirement. During his career, he served on the faculties of Wake Forest, Harvard, and Yale Universities, and the Graduate Summer Sessions in Epidemiology at the Universities of Minnesota and Michigan. He was Senior Behavioral Scientist at the Insurance Institute for Highway Safety in the 1970s. Much of his research focused on the effects of education, laws, regulations, and funding of preventive efforts on injury and disease risk. His publications include 15 books and 162 articles and chapters in the scientific literature. Royalties from his books are donated to educational endowments.