Sean Tabaie, MD

Michael Keller, M.D., is a pediatric immunologist at Children's National Hospital and specializes in the diagnosis and treatment of primary and secondary immunodeficiency disorders. He is the Director of the Jeffrey Modell Diagnostic and Research Center for Primary Immunodeficiency Disorders. He has authored many peer-reviewed articles and contributed to expert consensus guidelines on the treatment and diagnosis of primary immunodeficiency disorders. Dr. Keller is a member of theamerican Academy of Allergy, Asthma, and Immunology (AAAAI); the Clinical Immunology Society; the European Society of Immunodeficiency; and the Primary Immunodeficiency Treatment Consortium (PIDTC).

Priya Vaidyanathan, M.D., is a board-certified pediatric endocrinologist who has been on the staff of the Children's National Hospital since December 2005 soon after completing her pediatric endocrinology fellowship. She is the Director of the Thyroid Nodule and Cancer Program and Associate Director, Endocrinology Fellowship. She provides clinical care to patients with diverse endocrine needs, and her research interest is in the field of thyroid disorders.

Mohamad Jaafar, M.D., is a pediatric ophthalmologist at Children's National Hospital. He is presently the Dorothy, Jay, Kara and Mark Weinstein Professor and Chair Emeritus of the Children’s National’s Department of Ophthalmology and Professor of Ophthalmology and Pediatrics at the George Washington University. He is the Past-Director of the Pediatric Ophthalmology Fellowship Program, the oldest, largest and most prestigious such fellowship in the world.