Roger Mulder is Professor and former Head of Department of Psychological Medicine, University of Otago, Christchurch. His major research interests are personality disorders, mood disorders, psychiatry and medical disorders, and psychiatric classification. His clinical work is in consultation-liaison psychiatry. He has published over 350 articles and book chapters, and been cited over 11,500 times. He is Co-Editor in Chief of Personality and Mental Health, Associate Editor of the New Zealand Medical Journal, and Chair of the World Psychiatric Association Personality Disorders Section.