John Leung, MD is the founding physician of Boston Food Allergy Center, the director of the Food Allergy Center at Tufts Medical Center and co-director of the Pediatric Food Allergy Center at Floating Hospital for Children. He is the first US-trained physician triple board-certified in Allergy/Immunology, Gastroenterology, and Internal Medicine. Dr. Leung attended medical school at the University of Michigan Medical School and completed his internal medicine residency at University of Iowa Hospitals and Clinics. He then completed a 4-year clinical and research Gastroenterology fellowship at Tufts Medical Center, followed by an Allergy/Immunology fellowship at Massachusetts General Hospital/Harvard Medical School.

Dr. Leung is the site principal investigator for multiple NIH-funded and pharmaceutical-sponsored research studies. He is an assistant professor in the Department of Pediatrics and the Department of Medicine at Tufts University, an affiliated faculty of Tufts Institute for Innovation, and a nominating committee member of the Obesity, Metabolism & Nutrition section of the American Gastroenterology Association Institute Council. He has coauthored more than 40 peer-reviewed manuscripts, scientific abstracts, book chapters, and online tutorials. His clinical and research focus are on eosinophilic esophagitis, eosinophilic gastrointestinal disorders, food allergy & intolerance as well as other allergic/immunologic conditions.