Thomas E. Brown, Ph.D., has thought deeply about ADHD, basing much of his research the science of distraction. After serving 20 years on the faculty of Yale Medical School, he now teaches at Keck Medical School at the University of Southern California. In addition, he is the director of the Brown Clinic for Attention and Related Disorders, based in Manhattan Beach, California, as well as the author of the recent book Outside the Box: Rethinking ADD/ADHD in Children and Adults-A Practical Guide. Here are 20 questions and answers on this topic.