B. Timothy Walsh, M.D. is Ruane Professor of Pediatric Psychopharmacology in the College of Physicians & Surgeons at Columbia University and founder of the Eating Disorders Research Unit at the New York State Psychiatric Institute. He was chair of the Adolescent Mental Health Initiative's formal Commission on Eating Disorders, a blue ribbon panel of leading authorities convened in 2003 to assess the current research on these disorders; the findings of Dr. Walsh's commission make up the scientific foundation of this book. V. L. Cameron is a freelance writer based in New York City.