Norman Sartorius is President, Association for the Improvement of Mental Health Programs, Visiting and Associate Professorships at the Universities of London (UK) New York and St Louis (USA), Zagreb (Croatia) Beijing (China), Member of the Council of the World Psychiatric Association, Chairperson of the Section on Comorbidity of the World Psychiatric Association. Sir Graham Thornicroft is Honorary Consultant Psychiatrist, South London and Maudsley NHS Foundation Trust, working in a community mental health team to support homeless mentally ill people in South London, and Professor Emeritus of Community Mental Health, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK.