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 co-author of Driven to Distraction and the author of The Childhood Roots of Adult Happiness, and Worry, among other titles. He lives in Arlington, Massachusetts, with his wife and three children.