John B. Hagan

Dr. John B. Hagan is a distinguished Professor at Mayo Clinic College of Medicine and Science, specializing in Allergic Diseases within the Department of Internal Medicine. With over three decades of experience since earning his MD from the University of Tennessee in 1989, he has established himself as a leading expert in allergy and immunology.

His research focuses on allergic rhinitis, asthma, urticaria, drug reactions, latex allergy, and anaphylaxis, with particular emphasis on inflammatory mechanisms of asthma and eosinophilic inflammation. Dr. Hagan has contributed significantly to translational research involving diagnostic applications of sputum markers to characterize and quantify inflammation in asthma.

Analysis of his publication record from 1996-2023 reveals consistent scholarly output across allergy, immunology, and respiratory medicine. His work spans clinical guidelines development, systematic reviews, safety studies, and investigations into rare immunological conditions, with recent publications focusing on rhinitis management, aspirin-exacerbated respiratory disease, and contrast agent safety.

• 2015 Department of Medicine Laureate Award Mayo Clinic in Rochester
• 2012 Teacher of the Year Mayo Fellows Association
• 1995 Meritorious Research Award for Outstanding Scientific Achievement - Critical Care Mayo Clinic
• 1993 Von Pirquet Award American College of Allergy, Asthma & Immunology

As Education Chair for the Division of Allergic Diseases, Dr. Hagan plays a vital role in training medical students, residents, and fellows. His leadership extends to professional organizations where he serves as Chairman of the Rhinitis/Sinusitis/Ocular Committee for the American College of Allergy, Asthma and Immunology. His clinical practice in Rochester, Minnesota focuses on comprehensive care for patients with complex allergic conditions.