Donald Meltzer (1923-2004) is widely known as a psychoanalyst and teacher throughout Europe and South America. He is the author of many works on psychoanalytic theory and practice, including 'The Psychoanalytical Process', 'Sexual States of Mind', 'Explorations in Autism', 'The Kleinian Development', 'Dream Life', 'Studies in Extended Metapsychology', and 'The Claustrum', all published by Karnac Books. Alberto Hahn is a member of the British Psychoanalytic Society and works in a private practice in London. He also teaches psychoanalysis at the Tavistock Clinic, and lectures abroad. He is the translator into English of the 'Introduction to the Works of Bion' and the editor of ' Sincerity and Other Works: Collected Papers of Donald Meltzer'. He has written a number of clinical and theoretical papers, among them 'Observation and Intuition in the Psychoanalytic Situation', 'On Complaining', 'The Nature of the "Object" in the Claustrum', and 'Ways of Thinking about Adolescent Psychopathology'.