Troy McEwan, DPsych(Clinical), is Professor of Clinical and Forensic Psychology at the Centre for Forensic Behavioural Science, Swinburne University of Technology, and Senior Psychologist at Forensicare, Victoria, Australia. Michele Galietta, PhD, is an Associate Professor of Psychology at John Jay College of Criminal Justice, City University of New York, New York, USA. Alan Underwood, DClinPsy, is a Clinical Psychologist at the Stalking Threat Assessment Centre and Lecturer in Forensic Mental Health, Queen Mary University, London, UK.