Previously he was an Assistant Professor of Clinical Psychology at Columbia University College of Physicans and Surgeons, and a Research Scientist at the New York State Psychiatric Institute. He is the co-author of The Hidden Face of Shyness (1996, Avon Books) and Asperger's Syndrome: Intervening in Schools, Clinics, and Communities (2005, Erlbaum), and the co-producer of the video Understanding Asperger's (2000, Insight Media). He has