Liam Marshall

Liam received his degrees (BAH, MA, PhD) in Developmental Psychology from Queen’s University in Kingston, Ontario, Canada. He has been providing treatment and conducting research on offenders and forensic patients for more than 25 years. Liam has 100+ peer-reviewed publications and is co-author of four books. He is a board member and reviewer for many international journals. Liam has provided consultation to governments and delivered trainings for staff working with offenders and forensic patients in 26 countries. Liam was recently named an Association for the Treatment of Sexual Abusers (ATSA) Fellow for his extensive contributions to the organization’s goals. He is currently Director of Rockwood Psychotherapy & Consulting, a Researcher with the Waypoint Research Institute, and provides clinical services to Waypoint Centre for Mental Health Care, primarily in the High-Secure Provincial Forensics Programs Division.

Research Synopsis

Treatment and transition for forensic patients; the reduction of inpatient violence; the prediction of risk for elopement from general and forensic mental health settings; reducing the use of seclusion and restraint in institutional settings; dynamic criminogenic and protective factors in forensic patients; adverse childhood experiences in forensic patients; sexually offensive behaviour; effective psychotherapy for patients with a psychotic disorder.

Recent Publications

Olver, M. E., Marshall, L. E., Marshall, W. L., & Nicholaichuk, T. P. (2020). A Long-Term Outcome Assessment of the Effects on Subsequent Reoffense Rates of a Prison-Based CBT/RNR Sex Offender Treatment Program with Strength-Based Elements. Sexual Abuse, 32, 127-153.

Moulden, H. M., & Marshall, L. E. (2017). Major mental illness is those who sexually abuse. Current Psychiatry Reports. DOI: 10.1007/s11920-017-0863-x

Marshall, W. L., Marshall, L. E., & Olver, M. E. (2017). An evaluation of strength-based approaches to the treatment of sex offenders: a review. Journal of Criminal Psychology, 7 (3), pp.221-228. DOI: 10.1108/JCP-04-2017-0021

Marshall, L. E. (Winter 2016). What is the risk for sexual reoffending in older sex offenders? Prepared for H. M. Moulden (Ed.) Sexual Behaviour Clinic: Did you know? Frequently asked questions from the ATSA Forum, Vol 28(1). Available online: http://www.atsa.com/content/forum-newsletter

Marshall, L. E., & Marshall, W. L. (Eds.) (2017). The Wiley-Blackwell handbook on the assessment, treatment, and theories of sexual offending, Volume III: Treatment, D. Boer (series Ed.). Chichester, UK: John Wiley & Sons.

Marshall, L. E. (in press). Antisocial Personality Disorder in Sexual Offenders. In D. Black & N. Kolla (Eds.), the Textbook of Antisocial Personality Disorder. American Psychiatric Publishing.

Marshall, L. E. (in press). The Utility of Treatment for Sexual Offenders. In J. Proulx, F. Cortoni, L. A. Craig, & E. Letourneau (Eds.), The Wiley Handbook on What Works with Sexual Offenders: Contemporary Perspectives in Theory, Assessment, Treatment and Prevention. Chichester, UK: John Wiley & Sons.

Marshall, L. E. & Roters, J. (2019). Approaches to the Psychological Treatment of Sexual Offenders. In R. D. Morgan (Editor in Chief), M. E. Olver (Section Ed.), The SAGE Encyclopedia of Criminal Psychology. Thousand Oaks, USA: Sage Publications.

Marshall, W. L., & Marshall, L. E. (2020). Empathy and sympathy: Their presumed role in sexual offending and in sex offender treatment. In W.D. O'Donohue & P.Schewe (Eds.) Handbook of sexual assault and sexual offender treatment. pp. 229-240. Cham, Switzerland: Springer Nature Switzerland.

Marshall, L. E., & Marshall, W. L. (2017). Motivating sex offenders to enter and effectively engage in treatment. In D. Wilcox, M. Donathy, R. Gray, & C. Bain (Eds.), Working with Sex Offenders: A Guide for Practitioners (pp. 98-112). Oxon, UK: Routledge.

Marshall, L. E. & Roters, J. (2017). Sex offender treatment in correctional and forensic settings. In J. L. Ireland, C. A. Ireland, M. Fisher, & N. Gredecki (Eds.), The Routledge International Handbook of Forensic Psychology in Secure Settings (pp. 118-130). Oxon, UK: Routledge.

Marshall, W. L., & Marshall, L. E. (2018). Sexual Sadism. In V. Zeigler-Hill & T. K. Shackelford (Eds.), Encyclopedia of Personality and Individual Differences. New York: Springer. DOI 10.1007/978-3-319-28099-8_1112-1.

Marshall, W.L., et Marshall, L.E. (2017). Le traitement des délinquants sexuels adultes : une approche basée sur les forces (A strength-based treatment approach for adult sex offenders). Dans F. Cortoni et T. H. Pham (Éds.), Traité de l’agression sexuelle (pp.165-177). Montréal, Canada: Presses de l’Université de Montréal.

Marshall, L. E. (2016). Where to from here? In L. E. Marshall & W. L. Marshall (Eds.), The Wiley-Blackwell handbook on the assessment, treatment, and theories of sexual offending. Volume: Treatment. Chichester, UK: John Wiley & Sons.

Marshall, W. L. & Marshall, L. E. (2016). The treatment of adult sex offenders. For L. E. Marshall & W. L. Marshall (Eds.), The Wiley-Blackwell handbook on the assessment, treatment, and theories of sexual offending. Volume: Treatment. Chichester, UK: John Wiley & Sons.

Honours and Awards

Name: 2018 - Waypoint Centre for Mental Health Care Core Value Award: Leadership (Nominee)
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Name: 2017 - Waypoint Centre for Mental Health Care Core Value Award: Patient Safety; for work on Falls Risk Tool evaluation
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Name: 2016 – Named a Fellow of the Association for the Treatment of Sexual Abusers (ATSAF)
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Name: 2015 - Waypoint Centre for Mental Health Care Core Value Award: Accountability (Nominated); the Acute Risk of Violence Research Team: Liam Marshall (Team Lead), Laura Ball, Matt Keating, Jennifer Roters, & Jenna Rutherford
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Name: 2012 - Society for Sex Therapy and Research (SSTAR) 2012 Health Professional Book of the Year Award
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