Jennifer A. Clegg is Adjunct Professor at La Trobe University, Australia, where she developed and taught for four years the course 'Non-behavioural Approaches to Challenging and Complex Needs' for their Masters in Disability Studies. For 25 years she was both an Associate Professor and Clinical Psychologist in Nottingham, UK, carrying out research and clinical intervention with distressed adults who have intellectual disability and their parents and staff. She has published 48 peer-reviewed articles, nine book chapters and two books: Critical Issues in Clinical Practice (SAGE, 1998), and New Lenses on Intellectual Disabilities (Routledge, 2020). Richard Lansdall-Welfare worked as a Clinical Director and Consultant Psychiatrist in Nottinghamshire, UK, with adults who have intellectual disability and their families. His practice was both community and in-patient based, and involved the full-range of mental health difficulties experienced by this group. He implemented specialist services for those with additional needs such as epilepsy, nutritional difficulties and complex neurodevelopmental conditions, also contributing to service modelling at national and international level. He has published 10 peer-reviewed articles.