Ross G. Menzies, a clinical psychologist, is Associate Professor and Head of the School of Behavioural and Community Health Sciences at the University of Sydney. He is also Head of Sydney University's Anxiety Disorders Clinic and Anxiety and Stress Research Group. He was a founding member of the Anxiety Disorders Foundation of Australia (NSW Branch), serving on the Board of the Association for 2 years. He is the past National President, and current NSW President, of the Australian Association for Cognitive Behaviour Therapy. Professor Menzies holds several other honorary appointments, including Honorary Associate of the Department of Medical Psychology at Westmead Hospital, Honorary Associate of the Sydney Clinic, member of the Advisory Board of the Sydney Anxiety Disorders Practice and Clinical Director of Anxpsych, an organisation bringing anxiety management skills to the corporate sector. He has been the overseas expert trainer in cognitive behavioural therapy at the National University of Singapore. In addition to his university and hospital commitments, he has run a private clinic specialising in OCD for the past 15 years. He continues to attract patients from across metropolitan Sydney, rural NSW, interstate and from overseas to this unit. His recent research has focused on the origins and cognitive mediation of OCD. He is the co-developer of the Danger Ideation Reduction Therapy (DIRT) package for compulsive washing. He is a member of the Obsessive Compulsive Cognitions Working Group and is the Founder of the Australian and New Zealand OCD Research Alliance, a co-operative of leading Australasian psychologists and psychiatrists researching in this area.
Padmal de Silva is Senior Lecturer in Psychology at the Institute of Psychiatry, King's College, University of London, and Senior Clinical Tutor for the Institute's doctoral training programme in clinical psychology. He is also Consultant Clinical Psychologist at the South London and Maudsley National Health Service Trust. He has been involved in clinical and research work in obsessive-compulsive disorder and other anxiety disorders for many years. He is the co-author, with Stanley Rachman, of Obsessive-compulsive Disorder—The Facts, and Panic Disorder—The Facts, both published by Oxford University Press.