Professor DeMatteo's research interests include psychopathy, forensic mental health assessment, drug policy, and offender diversion. His research has been funded by the National Institute on Drug Abuse, Pennsylvania Department of Health, Pennsylvania Commission on Crime and Delinquency, and American Psychology-Law Society.
Professor DeMatteo is licensed as a psychologist in Pennsylvania, where he conducts forensic mental health assessments of juveniles and adults. He has co-authored three books in his field, with two more forthcoming, and more than 60 articles and book chapters. He is the associate editor of Law and Human Behavior, on the editorial boards of Criminal Justice & Behavior and the Open Access Journal of Forensic Psychology, and a reviewer for more than 15 scientific journals. Professor DeMatteo was chair of the American Psychological Association's (APA) Committee on Legal Issues in 2011, and he is currently council representative to APA for the American Psychology-Law Society (Div. 41 of APA).
Professor DeMatteo received a B.A. with high honors in psychology from Rutgers University, an M.A. and Ph.D. in Clinical Psychology from MCP Hahnemann University, and a J.D., magna cum laude, from the Villanova University School of Law. He was also the executive editor of the Villanova Law Review and a member of the Order of the Coif.