Peter Fonagy is Freud Memorial Professor of Psychoanalysis and Director of the Sub-Department of Clinical Health Psychology at University College London. He is Chief Executive of the Anna Freud Centre, London. He is a clinical psychologist and a training and supervising analyst in the British Psychoanalytical Society in child and adult analysis. He has published over 200 chapters and articles and has authored or edited several books. Marianne Leuzinger-Bohleber is a training analyst in the German Psychoanalytical Association, former Chair of the Research Subcommittees for Conceptual Research, and a member of the Swiss Psychoanalytical Society. She is Vice Chair of the Research Board of the International Psychoanalytical Association, Full Professor for Psychoanalysis at the University of Kassel, and head Director of the Sigmund Freud Institute, Frankfurt/Main. Her main research fields include epistemology and methods of clinical and empirical research in psychoanalysis, interdisciplinary discourse with embodied cognitive science, educational sciences, and modern German literature.