In this episode of *Pediatric Perspectives*, I'm joined by Peter McCullough, M.D. — one of the world's most published cardiologists, an epidemiologist, and the lead author of what may be the most comprehensive scientific document on autism spectrum disorder ever produced. His McCullough Foundation report, *Determinants of Autism Spectrum Disorder*, spans 52 pages with 308 references and extensive supplemental material. Dr. McCullough entered this arena not from a place of advocacy but from an epidemiologic one: when the numbers stopped making sense, he followed the data.
