1. Editor of the ADHD Report and previously a Clinical Professor of Psychiatry at Virginia Commonwealth University School of Medicine. He is now retired from his work in academic medical centers.
2. Professor of Psychology and Neuroscience at the university of Colorado-Boulder.
3. Director of Research in the Department of Neuropsychology at the Kennedy Krieger Institute, and Associate Professor of Psychiatry and Behavioral Sciences at the Johns Hopkins University School of Medicine in Baltimore, MD.