Armon J. Tamatea (Rongowhak¿ta; Te Aitanga-a-M¿haki), PhD., PGDipPsych(Clin) is a clinical psychologist who served as a clinician and senior research advisor for Ara Poutama Aotearoa/Department of Corrections (New Zealand) before being appointed senior lecturer in psychology at the University of Waikato, Hamilton, New Zealand. He has worked extensively in the assessment and treatment of violent and sexual offenders and contributed to the design and implementation of an experimental prison-based violence prevention programme for high-risk offenders diagnosed with psychopathy. His research interests include institutional violence, psychopathy, New Zealand gang communities, and exploring culturally informed approaches to offender management. Armon currently divides his professional time between research, teaching, supervision, and clinical practice in the criminal justice arena.

Andrew J. Day is an enterprise professor in the School of Social and Political Sciences, University of Melbourne, Australia. His interests are in criminological psychology, especially the development of interventions to improve wellbeing and reduce risk.

David J. Cooke is a chartered forensic and chartered clinical psychologist in Australian Catholic University. He has long-standing research and clinical interests in violence risk; including the risks created by the ecologies of institutions. He is a co-author of PRISM and has carried out PRISM evaluations in institutions in many countries.