When the first edition of Pediatric Psychopharmacology published in 2002, it filled a void in child and adolescent psychiatry and quickly establishing itself as the definitive text-reference in pediatric psychopharmacology. While numerous short, clinically focused paperbacks have been published since then, no competitors with the scholarly breadth, depth, and luster of this volume have emerged. In the second edition, Christopher Kratochvil, MD, a highly respected expert in pediatric psychopharmacology, joins the outstanding editorial team led by Dr. Martin and Dr. Scahill. In the new edition, the editors streamline the flow of information to reflect the growth in scientific data since the first edition appeared. The overall structure of the book remains the same, with major sections on underlying biology; somatic interventions; assessment and treatment; and special considerations. Andres Martin, Professor of Child Psychiatry and Psychiatry Director of Medical Studies, Yale Child Study Center, Yale University School of Medicine, Edited by Lawrence Scahill, Associate Professor of Child Psychiatry and Nursing, Yale Child Study Center, Yale University School of Medicine, and Edited by Christopher Kratochvil, Professor of Psychiatry and Pediatrics, University of Nebraska Medical Center Andrés Martin, MD, MPH is the Riva Ariella Ritvo Professor at the Yale Child Study Center. He serves as medical director of the Children's Psychiatric Inpatient Service (CIPS) at Yale-New Haven Children's Hospital, and as editor-in-chief of the flagship Journal of the American Academy of Child and Adolescent Psychiatry. Lawrence Scahill, MSN, PhD is Professor of Nursing and Child Psychiatry at Yale University. He directs the Yale Research Unit on Pediatric Psychopharmacology focused on the development and testing of pharmacological treatments for children with serious psychiatric disorders. Christopher J. Kratochvil, M.D. is the Assistant Vice Chancellor for Clinical Research at the University of Nebraska Medical Center. He serves as the Chief Medical Officer of UNeHealth. Additionally, he is a Professor of Psychiatry & Pediatrics, and Assistant Director of the Psychopharmacology Research Consortium.