ANITA THAPAR, MBBCh, PhD, FRCPsych, FMedSci, CBE, Professor of Child and Adolescent Psychiatry, Child and Adolescent Psychiatry Section, Division of Psychological Medicine and Clinical Neurosciences, Cardiff University School of Medicine, Cardiff, UK. DANIEL S. PINE, MD, Chief, Section on Development and Affective Neuroscience, National Institute of Mental Health (NIMH) Intramural Research Program, Bethesda, MD, USA. SAMUELE CORTESE, MD, PhD, NIHR Research Professor and Professor of Child and Adolescent Psychiatry, University of Southampton, UK. CATHY CRESWELL, BA (Ox Hons), DClinPsy, PhD, Professor of Developmental Clinical Psychology, Departments of Experimental Psychology and Psychiatry, University of Oxford, Oxford, UK. TAMSIN J. FORD, PhD, FRCPsych, FMedSci, CBE, Professor of Child and Adolescent Psychiatry, Department of Psychiatry, University of Cambridge, Cambridge, UK. JAMES F. LECKMAN, MD, PhD, Neison Harris Professor of Child Psychiatry, Child Study Center, Yale University, New Haven, CT, USA. ARGYRIS STRINGARIS, MD, PhD, FRCPsych, Professor of Child and Adolescent Psychiatry, Faculty of Brain Sciences, University College London, London, UK.