William R. Lindsay, Ph D, Consultant Forensic Clinical Psychologist, The State Hospital, Carstairs; Head of Clinical Psychology (Intellectual Disability) NHS Tayside & Chair of Learning Disabilities, University of Abertay Dundee, Dundee, UK Bill Lindsay is Consultant Forensic Clinical Psychologist atthe State Hospital, Head of Clinical Psychology (Learning Disabilities) in Tayside and Professor of Learning Disabilities atthe University of Abertay, Dundee, Scotland. He is a practicingclinician, has over 150 publications, and has directed severalmajor research projects. John L.Taylor, DPsychol, Head of Psychological Therapies&Research and Consultant Clinical Psychologist, Northgate & Prudhoe NHS Trust, Northumberland & Principal Lecturer in Clinical Psychology, Northumbria University, Newcastleupon Tyne, UK Since qualifying as a clinical psychologist, John Taylor hasworked mainly in developmental disability and forensic services incommunity, medium secure, special hospital and prison settings inthe UK. In recent years he has published work related to hisresearch interests in assessment and treatment of offenders withdevelopmental disabilities in a range of research and professionaljournals. Peter Sturmey, Ph D, Associate Professor of Psychologyin the Department of Psychology, Queens College and The Graduate Center, City University of New York & Research Associate at the Institute for Basic Research, Staten Island, USA Peter Sturmey has published widely on intellectualdisabilities, especially in the areas of challenging behaviours, functional assessment, dual diagnosis and staff training. His current research interests include restraint reduction, clientpreferences for staff members, mood disorders and dissemination ofbehavioural technology.