Nicole Vliegen, PhD, is Professor of Clinical Psychology at KU Leuven, Belgium, where she heads the postgraduate training programmes in Psychodynamic Child Psychotherapy and Infant Mental Health. She is a licensed psychodynamic child psychotherapist and heads the team of psychodynamic child psychotherapists at PraxisP, the clinical centre of KU Leuven. Eileen Tang, PhD, is a postdoctoral researcher in Clinical Psychology at KU Leuven and Professor in Psychology at Vrije Universiteit Brussel, Belgium. She is a licensed psychodynamic child psychotherapist and is part of the team at PraxisP. Nick Midgley, PhD, is a child and adolescent psychotherapist and Professor of Psychological Therapies with Children and Young People at UCL/the Anna Freud Centre, UK. He has edited and co-authored several books, including Mentalization-Based Treatment with Children:A Time-Limited Approach (2017). Patrick Luyten, PhD, is Professor at the Faculty of Psychology and Educational Sciences, KU Leuven, Belgium and Director of the PhD in Psychoanalysis Programme at University College London, UK. He heads a treatment service for patients with depression and functional somatic disorders at PraxisP. Peter Fonagy is Head of the Division of Psychology and Language Sciences at University College London; Chief Executive of the Anna Freud Centre, UK; Consultant to the Child and Family Programme at Baylor College of Medicine and visiting professor at Yale and Harvard Medical Schools. He has received Lifetime Achievement Awards from several national and international professional associations.