Dr. Summar joined Children's National in 2010 where he built and leads the Rare Disease Institute. He is best known for his work in developing registries and treatment standards for rare diseases. His laboratory work currently focuses on filling gaps in knowledge and testing for biochemical rare disorders. He has been listed with Best Doctor's in America since 2004. He is the National Organization for Rare Disorders Board Chairman and helped develop NORD programs around natural history studies, undiagnosed disorders, and clinical centers of excellence in rare disease.