M.D. University of Pennsylvania and M.P.H. Epidemiology of the Johns Hopkins School of Hygiene and Public Health. He joined the NCI as staff fellow in 1983 and in 1996, he was appointed Head of the Section of Interdisciplinary Studies of Environmental Epidemiology Branch (which later became the HPV Research Group in Power hormonal and Epidemiologic reproductive). He joined the Clinical Genetics Branch in October 2009 to study intensively why HPV is a powerful carcinogen exposure, similar to a genetic trait with high penetrance acquired for cancer phenotype. He received a Fulbright scholarship in 1977 to conduct epidemiological studies in Senegal and has received numerous awards for his work in molecular epidemiology, including the Medal of Honor of the AEC and the AACR-Prevent Cancer Foundation Award.