John Leung, MD, AGAF, FACAAI

★★★★★ 4.7 out of 5 (1,049 Ratings)

Accepting New Patients

Titles:

  • Founder and CEO of Boston Specialists, Boston

  • Chairman of the board for Yang YMCA, Boston

  • Director Emeritus, Kwong Kow Chinese School, Boston

Clinical Interests:

  • Eosinophilic esophagitis & EGID

  • Eczema, Food allergy, Seasonal allergy, General Allergy

  • IBS/bloating, IBD

  • Mast Cell GI Diseases & MCAS

Biography:

John Leung, MD, AGAF, FACAAI is a U.S. physician dual board certified in Allergy/Immunology and Gastroenterology. He attended the University of Michigan Medical School and completed his internal medicine residency at the University of Iowa Hospitals and Clinics, where he focused on intestinal mucosal immunology under the mentorship of Dr. Joel Weinstock. He then completed a Gastroenterology fellowship at Tufts Medical Center and an Allergy/Immunology fellowship at Massachusetts General Hospital/Harvard Medical School.

Dr. Leung began his career in academic medicine, working on several NIH-funded research projects. He is a site principal investigator for the Consortium of Eosinophilic Gastrointestinal Disease Researchers (CEGiR). He established and directed the Center for Food Related Diseases at Tufts Medical Center and the Pediatric Food Allergy Center at Tufts Children’s Hospital.

In 2015, Dr. Leung founded Boston Specialists/Boston Food Allergy Center, which has become one of New England’s leading independent clinical and research centers, caring for approximately 450–600 patients per week. Since 2010, he has conducted more than 75 industry- and federally funded clinical trials.

His clinical and research interests focus on eosinophilic gastrointestinal diseases, mast cell gastrointestinal disorders, and food allergy/intolerance. He has co-authored more than 80 peer-reviewed manuscripts, including an article in The New England Journal of Medicine, along with numerous scientific abstracts, book chapters, and online educational materials.

Dr. Leung has been invited to lecture at many respected institutions and organizations, including Tufts University School of Medicine, Massachusetts General Hospital, Brigham and Women’s Hospital, Beth Israel Deaconess Medical Center, the Massachusetts Medical Society, Scripps Clinic, the American College of Allergy, Asthma & Immunology, and the American Gastroenterological Association. He has been recognized as a Top Doctor by Boston Magazine since 2025.

Overview:

  • Board Certifications: Gastroenterology, Allergy

  • Medical School: University of Michigan Medical School

  • Residency: University of Iowa Hospitals and Clinics

  • Gastroenterology fellowship: Tufts Medicine

  • Allergy/Immunology fellowship: Massachusetts General Hospital/Harvard Medical School

  • Medical Licenses: Massachusetts, Maine, New Hampshire

Patient Reviews

  • ★★★★★ 2020 Mariam A. Verified patient: “Excellent physician! Very intelligent and listens. Great staff! Wonderful office”

  • ★★★★★ 2023 Violet V.Verified patient: “Very pleased. He took time to explain everything including the steps we would be taking in the future.”

  • ★★★★★ 2019 Tonya S. Verified patient: “His practice was clean, responsive and Dr. Leung was very informative throughout the appointments. I would recommend.”

Recent publications:

  1. Gastro Hep Advances. 2026 Mar 13

  2. Clinical and Translational Gastroenterology. 2025 Oct 01

  3. Journal of Allergy and Clinical Immunology. 2024 Sep 01

  4. Clin Gastroenterol Hepatol. 2021 Jan 22;S1542-3565(21)00075-6.

  5. N Engl J Med 2020; 383:1624-1634

  6. J Pediatr Gastroenterol Nutr 2020 Oct;71(4):524-529

  7. J Allergy Clin Immunol 2020 Jun;145(6):1629-1640.e4

  8. Gastroenterology 2020;159:20–25

See more publications

Research + Clinical Trials

Dr. Leung’s Laboratory

Community and Professional Leadership

  • Director Emeritus, Board of Directors, Kwong Kow Chinese School, Boston, MA

  • Chair, Advisory Board, Wang YMCA, Boston, MA

  • Medical Director, Kwong Kow Chinese School, Boston, MA

  • Secretary, Massachusetts Allergy & Asthma Society

Honors

  • 2024-2025 MediFind.com - 25 of the Best Gastroenterologists in Boston

  • 2025 SPOKIN.com - Top Rated Allergist in Boston

  • 2023-2025 Findatopdoc.com - Top Gastroenterologist, Allergist and Immunologist

  • 2021-2025 Threebestrated.com - Top 3 Immunologists in Boston

  • 2021-2025,Threebestrated.com - Top 3 Gastroenterologists in Boston

  • 2015 American College of Gastroenterology - SCOPY Award for Best Foreign Language Video, “Chinese Colonoscopy Prep”

  • 2010 Digestive Diseases Week Poster of Distinction

  • 2010 American Associations of Immunologists Block Symposium presentation

  • 2008 American Gastroenterological Association Academic Skills Workshop Travel Award

  • 2001 National Institutes of Health Summer Internship in Biomedical Research Award

  • 1999 National Science Foundation Summer Internship in Bioengineering Research Award

  • 1999 Phi Kappa Phi Honor Society, Tau Beta Pi Honor Engineering Society, Golden Key National Honor Society

Professional Memberships

  • Massachusetts Allergy & Asthma Society

  • American Medical Association

  • American Gastroenterological Association

  • American College of Gastroenterology

  • The Massachusetts Medical Society

  • American Academy of Allergy Asthma and Immunology

  • American College of Allergy, Asthma and Immunology

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