Eric Emerson, Ph.D., is Professor of Clinical Psychology at the Institute for Health Research at Lancaster University, UK. Prior to this, he held posts at the Hester Adrian Research Centre at the University of Manchester, the Tizard Centre (University of Kent at Canterbury) and the South East Thames Regional Health Authority, and as a clinical psychologist in the UK and Canada. He has written several books and over 140 articles in academic and professional journals on issues related to supported accommodation, challenging behaviour and health/social care services for children and adults with intellectual disabilities. Chris Hatton, Ph.D., is Professor of Psychology, Health and Social Care at the Institute for Health Research at Lancaster University, UK, having previously held research posts at the Hester Adrian Research Centre, University of Manchester, UK. He has written or edited several books and almost 100 articles in academic and professional journals on a range of issues concerning people with intellectual disabilities, including the assessment of service quality, supported accommodation, staffing issues, and the experiences of people with intellectual disabilities and their families from minority ethnic communities in the UK. Travis Thompson, Ph.D., is Executive Program Director of the Minnesota Autism Center and Professor, Department of Pediatrics, University of Minnesota School of Medicine, Minneapolis, USA. He has published 24 books and more than 240 articles, chapters in journals and monographs. He has served on numerous national and international committees concerned with research, ethics, and policy. His research has focused on the environmental and biological factors underlying the challenging behaviour of people with developmental disabilities, including communication, architectural design, and genetics variables. Trevor R. Parmenter, Ph.D., holds the Foundation Chair of Developmental Disability in the Faculty of Medicine, and the Adjunct Chair in the Faculty of Education, at the University of Sydney, Australia. He is the Director of the Centre for Developmental Disability Studies in the Royal Rehabilitation Centre, Sydney. His former positions include Professorial Fellow and Director of the Unit for Community Integration Studies at Macquarie University, Australia, prior to which he held teaching and administrative positions in the New South Wales Department of Education and Training. Currently, he is the Immediate Past President of the International Association for the Scientific Study of Intellectual Disabilities. His publications include 80 articles in professional journals and 45 book chapters in the areas of disability policy, quality of life, dual diagnosis, and vocational training.