About
Dr. John Leung holds dual board certifications in gastroenterology and allergy and immunology. He earned his medical degree at the University of Michigan Medical School and completed his internal medicine residency at the University of Iowa Hospitals and Clinics. He then pursued a gastroenterology fellowship at Tufts Medical Center, where he also worked as a gastroenterology consultant before completing a clinical and research fellowship in allergy and immunology at Massachusetts General Hospital and Harvard Medical School.
Dr. Leung focuses his clinical and research work on eosinophilic esophagitis and food allergy. He has co-authored more than 40 peer-reviewed manuscripts, scientific abstracts, book chapters, and online tutorials throughout his career.
Education & Training
Medical School
University of Michigan Medical School
Residency
Internal Medicine, University of Iowa Hospitals and Clinics
Fellowship
Gastroenterology Fellowship, Tufts Medical Center; Allergy/Immunology Fellowship, Massachusetts General Hospital/Harvard Medical School
Certifications
Conditions Treated
Who is Dr. Leung right for?
Dr. Leung is a strong fit for patients dealing with complex gastrointestinal or allergic conditions. Adults with eosinophilic esophagitis, food allergies, or overlapping GI and immune concerns benefit from his dual specialization. Patients who want a physician with deep research experience in their condition will find his background valuable. He suits those seeking both clinical care and access to cutting-edge findings in his specialty.
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Frequently Asked Questions
Dr. Leung specializes in gastroenterology and allergy and immunology. His primary clinical and research focus centers on eosinophilic esophagitis and food allergy. He also treats a broad range of gastrointestinal and allergic conditions.
Yes, Dr. Leung holds dual board certifications. He is board certified in both gastroenterology and allergy and immunology.
Dr. Leung completed a gastroenterology fellowship at Tufts Medical Center, where he also served as a gastroenterology consultant. He then completed a clinical and research fellowship in allergy and immunology at Massachusetts General Hospital and Harvard Medical School.
Dr. Leung earned his medical degree at the University of Michigan Medical School. He completed his internal medicine residency at the University of Iowa Hospitals and Clinics.
Yes, Dr. Leung has an active research background. Over his career, he has co-authored more than 40 peer-reviewed manuscripts, scientific abstracts, book chapters, and online tutorials, primarily focused on eosinophilic esophagitis and food allergy.
Yes. Dr. Leung's dual board certifications in gastroenterology and allergy and immunology make him well suited to treat patients whose conditions overlap both specialties. His focus on eosinophilic esophagitis reflects exactly this kind of intersection between gastrointestinal and allergic disease.
Doctor profile last updated March 21, 2026