Dr. Weiss has been an epidemiologist for 50 years. While much of his work has been directed towards cancer epidemiology and epidemiologic methods, he has had a consistent interest in clinical epidemiology, i.e. the study of the outcome of illness. In 1986, he published a book on this subject - Clinical Epidemiology: The Study of the Outcome of Illness (Monographs in Epidemiology and Biostatistics, 36) - which is now in its third edition.