Edward M. Hallowell, M.D., is an instructor at Harvard Medical School and director of the Hallowell Center for Cognitive and Emotional Health in Sudbury, Massachusetts, an outpatient treatment center serving children and adults with a wide range of emotional and learning problems. He is the coauthor of Driven to Distraction (with John J. Ratey, M.D.) and the author of When You Worry About the Child You Love, Worry, and Connect, among other titles. He and his wife have three children and they live in Arlington, Massachusetts. He welcomes hearing from readers, and can be reached through his Web site: www.DrHallowell.com.