Dr. Stevenson’s career has been focused on birth defects, intellectual disability, autism, and related disorders. He is board certified in pediatrics, clinical genetics, and cytogenetics. He has authored 227 publications including three editions of Human Malformations and Related Anomalies, two editions of an Atlas of X-linked Intellectual Disability Syndromes and two editions of The Fetus and Newly Born Infant: Influences of the Prenatal Environment.