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 the 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 is among a select group of professionals in the U.S. to gain Board Certification in Forensic Psychology by the American Board of Professional Psychology.
He has co-authored four books in his field, including "Forensic Mental Health Assessment: a Casebook," published by Oxford University Press, as well as more than 80 articles and book chapters. He is the associate editor of Law and Human Behavior, on the editorial boards of several other journals and a reviewer for more than 20 scientific journals. Professor DeMatteo was chair of the American Psychological Association's Committee on Legal Issues in 2011, and he is currently council representative to APA for the American Psychology-Law Society. He is also a fellow of the American Psychological Association.
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.