Dr. Fred Volkmar, director of the Yale University Child Study Center, Irving B. Harris Professor of Child Psychiatry, Pediatrics and Psychology at Yale University School of Medicine and an international authority on autism spectrum disorders. He's the co-author of A Practical Guide to Autism.

Gardiner Harris, science reporter for "The New York Times"

Dr. Edwin Cook, an autism researcher at the University of Illinois Chicago and member of the American Psychiatric Association's work group proposing the changes to their diagnostic manual.