Dr. John Weisz is a Professor of Psychology at the Department of Psychology, Harvard University and Harvard Medical School. His research involves development and testing of interventions for youth mental health problems, as well as meta-analyses and systematic reviews characterizing and critiquing the science of youth mental health care. His most recent work involves development and testing of transdiagnostic approaches to youth psychotherapy, including treatment that uses modular design and treatment guided by a small number of broad principles of psychological change. He is especially interested in integrating evidence-based practices with strategies for personalizing treatment to fit individual youth and family characteristics. Weisz' meta-analyses provide a broad picture of the state of youth psychotherapy research and address specific questions about moderators of psychotherapy benefit.