He has extensive international experience of working in forensic settings including maximum security prisons for recidivists. His research was funded by European Union, Economic and Social Research Council, and UNICEF, and was published extensively in international peer-reviewed journals. He currently conducts a number of projects on psychopathy assessment in collaboration with Polish Prison Service, Khyber Pakhtunkhwa Department of Corrections (Pakistan), Pennsylvania Department of Corrections (USA), and Irish Prison Service. He is the founder of Journal of Criminal Psychology, Associate Editor of Deviant Behavior, and Editorial Board member of Journal of Criminal Justice.