David Veale and Rob Willson are the authors of the bestselling Overcoming Obsessive Compulsive Disorder and Manage Your Mood. David Veale is a consultant psychiatrist in CBT at the South London and Maudsley NHS Foundation Trust and the Priory Hospital, North London. He is Honorary Senior Lecturer at the Institute of Psychiatry, Kings College London and President of the British Association of Behavioural and Cognitive Psychotherapies. Rob Willson is a CBT therapist in private practice and a tutor at Goldsmiths College, University of London. Alex Clarke is a Consultant Clinical Psychologist at the Royal Free Hospital, London.