Extraordinary People: Understanding Savant Syndrome is a book authored by Darold A. Treffert. The book was first published in 1887 by Dr. J. Langdon Down in 1887. It was the first book of its kind to present many cases of Autistic savant, and "documents the spectacular abilities of these remarkable people, and describes as well the love, determination, and dedication of their equally remarkable families, teachers and caregivers" [1] while the subsequent edition records observations and comments gathered for more than forty years by Dr. Treffert. The book is divided into three parts, namely, 'Genius Among Us', 'Portraits', and 'Genius Within Us'; and is preceded by a section recording Acknowledgments, an Introduction, a Prolouge, and a separate section named Savant Syndrome:Defining the Con