Dr. John Leung

Dr. John Leung is a highly experienced physician and the founding physician & CEO of Boston Specialists, where he combines deep clinical insight with compassionate, patient-centered care. He is dual board-certified in Gastroenterology and Allergy/Immunology, trained at top programs including the University of Michigan Medical School, the University of Iowa Hospitals and Clinics, Tufts Medical Center, and Massachusetts General Hospital/Harvard Medical School. His clinical practice focuses on complex immune-mediated and gastrointestinal conditions such as eosinophilic gastrointestinal diseases, food allergies and intolerances, seasonal allergies, asthma, eczema, and related disorders, offering individualized care that bridges digestive health and immune function. Many patients appreciate his thoughtful approach and clear communication, attributes that have helped him build a strong reputation in both specialties.

In addition to his clinical work, Dr. Leung is an active clinician-scientist and educator. He serves as an adjunct professor at Tufts University and has been involved in numerous NIH-funded and industry-sponsored clinical trials, contributing to advancements in understanding and treating eosinophilic esophagitis and other challenging conditions. He has co-authored more than 50 peer-reviewed manuscripts, book chapters, and scientific abstracts, and has lectured at leading academic centers. His commitment to research and training helps ensure that patients benefit from care informed by the latest evidence and best practices, while also mentoring the next generation of healthcare providers.