ANTHONY RYLE, DM (Oxon), was a Consultant Psychotherapist at St. Thomas' Hospital, London, having initially worked as an inner London GP, and then as Director of Sussex University Health Service. As a GP, he undertook clinical research in mental health and developed an interest in psychotherapy integration, which ultimately led to the development of CAT. After his retirement from St. Thomas', he remained actively involved in teaching, supervision and research in the NHS and through the UK Association for Cognitive Analytic Therapy (ACAT) until his passing in 2016.

IAN B. KERR, MD (Edin), has been a Consultant Psychiatrist and Psychotherapist in the NHS in London, Sheffield, and Lanarkshire in the UK, and currently works in Northland, New Zealand-Aotearoa. He undertook a range of psychotherapy trainings including in CAT with Anthony Ryle, with whom he worked closely over many years. His clinical and research interests centre around working with 'severe and complex' and 'difficult' presentations, including systemically and cross-culturally. He has taught on and been trainer for many CAT courses in the UK and internationally.