Peter Fonagy, OBE, FMedSci, FBA, FAcSS, is Professor of Contemporary Psychoanalysis and Developmental Science and Director of the Division of Psychology and Language Sciences at University College London (UCL), and is Chief Executive of the Anna Freud National Centre for Children and Families. Dr. Fonagy is Senior Clinical Advisor on Children’s Mental Health at NHS England, Director of the UCLPartners Integrated Mental Health and Behaviour Change Programme, Consultant to the Menninger Department of Psychiatry and Behavioral Sciences at Baylor College of Medicine, and Visiting Professor at Yale and Harvard Medical Schools. His clinical interests center on early attachment relationships, social cognition, borderline personality disorder, and violence. A codeveloper of mentalization-based treatment, Dr. Fonagy has published more than 550 scientific papers, 250 chapters, and 20 books. David Cottrell, MA, MBBS, FRCPsych, is Foundation Chair in Child and Adolescent Psychiatry at the University of Leeds and has extensive experience in the development, management, delivery, and evaluation of services for children in the Leeds community. His research interests are in the evaluation of psychological interventions and child and adolescent mental health services (CAMHS). Professor Cottrell was coauthor of the U.K. National Institute for Health and Care Excellence (NICE) guidelines on management of depression in children and young people (Clinical Guideline No. 28). He is principal investigator of a large multicenter randomized controlled trial of systemic family therapy following teenage self-harm and coinvestigator on a second large multicenter randomized controlled trial evaluating multisystemic treatment for teenagers at risk. Jeannette Phillips, MBBS, MRCP(UK), MRCPsych, is a consultant psychiatrist (currently retired from clinical practice). She has served as Clinical Director for CAMHS for West Kent and Medway National Health Service (NHS) and Social Care Partnership Trust, and subsequently as Clinical Lead for CAMHS (South East Coast) at NHS England. Her professional interests include service design and delivery; the development of optimal clinical pathways; and training, consultation, and support to staff at the front line of all services, particularly schools and voluntary agencies. Dickon Bevington, MA, MBBS, MRCPsych, is a consultant in child and adolescent psychiatry, Cambridge and Peterborough NHS Foundation Trust, and a member of the Cambridgeshire Child and Adolescent Substance Use Service. He is also Medical Director of the Anna Freud Centre in London, where he is a developer of mentalization-based treatments. He has a special interest in developing and running services for young people who are multiply excluded and may be seen as “hard to reach” by conventional clinic-based services. He is a recipient of an Innovation Nation Award for his work in developing wiki-based treatment manuals. Danya Glaser, MBBS, DCH, FRCPsych, is Visiting Professor at University College London and Honorary Consultant in Child and Adolescent Psychiatry at Great Ormond Street Hospital for Children in London. She was a member of the U.K. Family Justice Council for 6 years and chaired the Development Group for the NICE guidelines “When to Suspect Child Maltreatment” (Clinical Guideline No. 89). Dr. Glaser has taught, researched, and written widely on various aspects of child maltreatment, including sexual and emotional abuse, fabricated or induced illness, and the effects of child maltreatment on the developing brain. She is past president of the International Society for the Prevention of Child Abuse and Neglect and chairs the Coram adoption panel in the United Kingdom. Elizabeth Allison, DPhil, is a psychoanalyst and Deputy Director of the Psychoanalysis Unit at University College London.