Autism, as a field, has undergone significant changes since the publication of the previous edition of Autism: Identification, Education, and Treatment. As the fastest growing developmental disability category, the autism spectrum has broadened to include individuals functioning across a wide range of cognitive abilities and behaviors. To highlight the intelligence, sophistication, and contributions to society of many persons on the autism spectrum, as well as to hear from a learned consumer herself, I have invited Dr. Temple Grandin to prepare the Foreword to this edition. Dr. Grandin is Associate Professor of Animal Science at Colorado State University. She is the author of Thinking in Pictures. Her words are unedited and enlightening.