Mark A. Riddle, MD, is a Professor of Psychiatry and Pediatrics at the Johns Hopkins University School of Medicine. His clinical work involves collaborating with primary care clinicians in a federally qualified health center and providing phone consultations to primary care clinicians. The focus of Dr Riddle’s research, teaching, and clinical practice is pediatric psychopharmacology, especially medication side effects. His publications include over 300 research articles, reviews, chapters, and edited volumes. He serves as a member of the NICHD-sponsored Data Monitoring Committee for the Best Pharmaceuticals for Children Act and as Chair of the Scientific Council of the NVLD Project. He was a member of the Institute of Medicine’s Committee on Review of Pediatric Studies Conducted Under the Best Pharmaceuticals for Children Act and the Pediatric Research Equity Act, and the principal investigator of an NIMH-sponsored, multisite study of interventions for children who have gained weight on antipsychotic medication, and the site-PI of a 6-year follow-up study of preschoolers who were treated with medication for ADHD. He was the Director of the Division of Child and Adolescent Psychiatry at Johns Hopkins from 1993-2009 and was the founding chair of the Interventions Review Committee for Disorders Involving Children and Their Families at the National Institute of Mental Health.