Dr. Barkley is a Diplomate (board certified) in three specialties, Clinical Psychology (ABPP), Clinical Child and Adolescent Psychology, and Clinical Neuropsychology (ABCN, ABPP). He is also a Fellow in the American Psychological Association. A clinical scientist, educator, and practitioner, he has published 25 books, rating scales, and clinical manuals now numbering 43 separate editions. He has also published more than 300 scientific articles and book chapters on ADHD and related disorders. He founded The ADHD Report (Guilford), a clinical newsletter in its 28th year and on which he serves as Editor. He has created seven award winning professional videos on ADHD and defiant children. Dr. Barkley has served on the editorial boards of and as a reviewer for numerous scientific journals. He was the President of the Section of Clinical Child Psychology, Division 12, of the American Psychological Association (1988)[now Division 53], and was President of the International Society for Research in Child and Adolescent Psychopathology (1991).