Joel T. Nigg, PhD, is a licensed clinical psychologist and an active scientist in the Department of Psychology at Michigan State University. His research on the etiology of and mechanisms involved in ADHD has been funded by the National Institutes of Health continuously since 1997. Dr. Nigg is best known for his work in helping to characterize the neuropsychological features of ADHD and its subtypes; he also studies temperamental and personality characteristics related to ADHD. He has published over 50 scientific articles on ADHD and related topics, and has presented his work at numerous natio...