Derek Bolton is Professor of Philosophy and Psychopathology at King’s College London. He read Moral Sciences at Cambridge University and proceeded to a doctorate on Wittgenstein’s philosophy. He trained in clinical psychology and for many years held a clinical academic post at the Institute of Psychiatry with clinical work in the Maudsley Hospital in London. His clinical research interests have included genetics, course and psychological treatments for post-traumatic stress, obsessive compulsion and generalised anxiety. Publications include numerous articles on clinical psychology and philosophy of psychiatry and three books: An Approach to Wittgenstein’s Philosophy, 1979; with Jonathan Hill, Mind, Meaning, and Mental Disorder: The Nature of Causal Explanation in Psychology and Psychiatry, 2e, Oxford University Press, 2004; and What is mental disorder? An essay in philosophy, science and values, Oxford University Press, 2008. His current research interests include a community led early prevention project in south London and writing towards two books on the biopsychosocial model.