JOHN M. HEATON is in private practice in London, UK as a psychiatrist and psychotherapist. He is a regular lecturer at Regent's College, London on the Advanced Diploma in Existential Psychotherapy programme, and also teaches regularly at Roehampton University, UK. He is a founder member of the Guild of Psychotherapists and was Director of Training in the Philadelphia Association, USA for many years. He was editor of Journal for Existential Analysis for seven years and his publications include: The Eye: Phenomenology and Psychology of Function and Disorder;  Wittgenstein for Beginners; Introducing Wittgenstein and Wittgenstein and Psychoanalysis.