Jean Proulx is a Professor in, and the Director of, the School of Criminology at the University of Montreal, and Researcher at the International Centre for Comparative Criminology at that university. Since 1987, he has also been active, both as researcher and forensic psychologist, in treatment programs for sex offenders at the Philippe-Pinel Institute of Montreal, a maximum-security psychiatric institution. His main research interests are the pathways in the offending process, personality profiles, and sexual preferences and recidivism risk factors in sexual murderers, rapists, paedophiles and incest offenders. Over the last 30 years, he has published 10 books, and more than 150 book chapters and peer-reviewed articles in French and in English. Franca Cortoni is Professor in the School of Criminology, University of Montreal, Canada, and a Research Fellow at the International Centre of Comparative Criminology. She previously worked in the Correctional Service of Canada as Director of Programming Research. She has published over 90 papers and 5 books on issues related to male and female sexual offenders. Her current research focuses on the effectiveness of treatment for sexual offenders. Leam A. Craig, is a Consultant Forensic and Clinical Psychologist and Partner at Forensic Psychology Practice, UK. He is a Visiting Professor of Forensic Clinical Psychology at Birmingham City University and Hon. Professor of Forensic Psychology at the University of Birmingham, UK. He acts as an expert witness in the assessment and treatment of offenders and in matters of child protection. He is a Fellow of the British Psychological Society and the Academy of Social Sciences and Chairs the Expert Witness Advisory Group. He has over 100 publications including 12 books. Elizabeth J. Letourneau is Professor, Department of Mental Health and Director, Moore Center for the Prevention of Child Sexual Abuse at the Johns Hopkins Bloomberg School of Public Health. She is recognized for her expertise on child sexual abuse perpetration prevention, practice and policy. She has published more than 100 papers and chapters informed by research funded by the Centers for Disease Control and Prevention, the National Institutes of Health, the National Institute of Justice, Oak Foundation, and the Open Society Foundation among others.