David A. Hafler, MD, is the William S. and Lois Stiles Edgerly Professor and Chairman Department of Neurology and Professor of Immunobiology, Yale School of Medicine, and is the Neurologist-in-Chief of the Yale-New Haven Hospital. David A. Hafler, MD is the William S. and Lois Stiles Edgerly Professor and Chairman Department of Neurology and Professor of Immunobiology, Yale School of Medicine, and is the Neurologist-in-Chief of the Yale-New Haven Hospital. He has made seminal discoveries in the pathogenesis of multiple sclerosis and autoimmune diseases include identification of human autoreactive T cells and the mechanisms that underlie their dysregulation with the discovery of human regulatory T cells. He led the discovery of genetic variants causing. Hafler was a Jacob Javits Merit Award Recipient from the NIH and was awarded the Dystel Prize for MS research from the AAN, the University of Miami Annual Distinguished Alumni Award, the Raymond Adams Prize from the ANA and is the 2023 recipient of the prestigious 2023 AAI Steinman Award for Human Immunology Research. He is an Honorary Member of the Scandinavian Society for Immunology and has been elected to membership in the AOA Society, the American Society of Clinical Investigation, The Association of American Physicians, and the National Academy of Medicine.