Peter S. Jensen, MD, is Director of the Center for the Advancement of Children's Mental Health and Ruane Professor of Child Psychiatry at the Columbia University College of Physicians and Surgeons. Previously, he was Associate Director of Child and Adolescent Research at the National Institute of Mental Health (NIMH), where he was the lead NIMH investigator on a major study of the treatment of ADHD. He is the author or editor of numerous scientific articles and books; has received prestigious national awards for his research, writing, and teaching; and serves on the board of directors of Children and Adults with Attention-Deficit/Hyperactivity Disorder (CHADD), among other organizations. This book is the first in a new series edited by Dr. Jensen, "Making the System Work for Your Child."