He has worked in public schools for many years and has experience working with over 1500 troubled children, adolescents and their families. He has also been Assistant Professor of Pediatrics at the University of Iowa College of Medicine and Associate Professor in the Department of Applied Psychology at the <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />University of Toronto and the Ontario Institute for Studies In Education. He is also a consultant to special education departments in numerous school districts. He is the author of over 50 articles published in education, psychology and medical journals and is the co-author of the books, Attention Deficit Disorder and Hyperactivity and Management of Children and Adolescents with Attention Deficit Hyperactivity Disorder.