Dr Fiona Challacombe is a research fellow and clinical psychologist working at Kings College London and the Maudsley Centre for Anxiety Disorders and Trauma. She is part of a national specialist service treating individuals with severe and complex OCD. Her research focuses on the impact of OCD on parenting and families, and investigating the delivery and refinement of CBT for parents with OCD.

Dr Victoria Bream Oldfield is a Clinical Psychologist working at the Centre for Anxiety Disorders and Trauma, Maudsley Hospital, London. She studied experimental psychology at the University of Oxford, clinical psychology at the Institute of Psychiatry, King's College London, and trained in CBT at the University of Oxford. Her research interests are in the phenomenology and treatment of OCD.

Professor Paul Salkovskis is Professor of Clinical Psychology and Applied Science and Programme Director of the forthcoming doctorate programme in clinical psychology at the University of Bath. He is editor of the scientific journal Behavioural and Cognitive Psychotherapy and a Fellow of the British Psychological Society. He has published over 250 scientific papers and recently received the Aaron T Beck award for contributions to cognitive therapy.