Paul received his Ph.D. in Crime, Law, and Justice with specializations in quantitative methods and demography from the Pennsylvania State University. He also received his M.Sc. and B.Sc. Degrees in Criminology from the Universite de Montreal, in Quebec, Canada. His research interests include statistical criminology, cross-national criminology, security studies, policing, and violence.
Paul has published studies in academic journals such as the British Journal of Sociology, Social Forces, Journal of Quantitative Criminology, Justice Quarterly, Journal of Criminal Justice, International Criminal Justice Review, and Social Science Research.