Christopher D. Webster is Professor Emeritus of Psychiatry at the University of Toronto, Canada, as well as Professor Emeritus of Psychology at Simon Fraser University. A Fellow of the Canadian Psychological Association, the American Psychological Association and the Royal Society of Canada, his publications include the first edition of this volume (Wiley-Blackwell, 2007), and Essential Writings in Risk Assessment and Management (2007), which he co-edited. Quazi Haque is Executive Medical Director for Partnerships in Care, one of the largest providers of mental health services in the UK. A Fellow of the UK Royal College of Psychiatrists and former lecturer at the Institute of Psychiatry’s Home Office Teaching Unit, he collaborated with Christopher Webster in developing a structured professional judgement training programme at the Institute of Psychiatry at Kings College London. Stephen J. Hucker is Professor of Psychiatry at the University of Toronto, Canada. A specialist in forensic psychiatry, he is a former head of the forensic programs at Toronto’s Clarke Institute of Psychiatry and has lectured widely on forensic psychiatry both to scientific and professional audiences. He maintains a private practice and is frequently called as an expert witness in legal cases.