In this book, Frank Yeomans, Diana Diamond and Eve Caligor provide a systemic review of Otto Kernberg’s multiple contributions to psychoanalysis, psychiatry, psychology and our understanding of the mind and group behaviour. The book spans the full scope of Kernberg’s career, both highlighting the diversity of topics on which his writings have shed light and emphasising conceptual threads that link the different areas of his work. It accessibly follows the experiences that had an impact on the development of his thought and the increasingly strong impact his writing and thinking have had on psychoanalysis and related fields. The authors draw on their decades of working closely with Kernberg to offer a unique insight into his teaching and research, focusing on his work on borderline and narcissistic pathology and the fundamental conceptualisation of personality disorders. Including an overview of Kernberg’s critique and expansion of traditional psychoanalytic training, as well as his role in developing Transference-Focused Psychotherapy, this book is an invaluable guide to students, researchers and analysts in practice and training looking to integrate Kernberg’s ideas into their own clinical and theoretical work.