Joel Nigg, Ph.D., is a clinical psychologist and a professor in the departments of psychiatry and behavioral sciences at Oregon Health & Science University. He directs the OSHU ADHD Research program and is also director of the division of psychology. Author of What Causes ADHD? Understanding What Goes Wrong and Why. Dr. Nigg has published nearly 200 peer-reviewed scientific papers related to the neuropsychological , cognitive, and temperamental correlates of child ADHD, to ADHD genetics, and to MRI- based research and theoretical interpretations of brain development in ADHD.

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