About Kohei Hasegawa, MD, MPH, PhD

Kohei Hasegawa, MD, MPH, MS is an attending physician at the MGH Department of Emergency Medicine and an Associate Professor at Harvard Medical School.  He received his MD from Tokai University (Japan) and MS (Computational Biology) and MPH degrees from Harvard University.  Dr. Hasegawa completed his emergency medicine residency and research fellowship at Massachusetts General Hospital. 

Dr. Hasegawa is an active clinician-scientist with 200+ publications and multiple NIH R01 grants. He is the founder/director of the Japanese Emergency Medicine Network (JEMNet) and a faculty member of Emergency Medicine Network (EMNet), multi-center collaborations that aim to improve public health through projects in emergency care, particularly multicenter clinical research.

Clinical Interests:




Mass General Emergency Medicine
55 Fruit St.
Boston, MA 02115
Phone: 617-724-4100

Medical Education

  • MD, Tokai University School of Medicine
  • PhD, Tokai University School of Medicine
  • Residency, Brigham and Women's Hospital
  • Residency, Tokai University Hospital

American Board Certifications

  • Emergency Medicine, American Board of Emergency Medicine

Accepted Insurance Plans

Note: This provider may accept more insurance plans than shown; please call the practice to find out if your plan is accepted.


Dr. Hasegawa has made significant contributions to the field of airway and respiratory emergency research. He has assembled a team of researchers from more than 50 centers to conduct several large-scale studies of emergency airway management and acute asthma management in the US and Japan.  His work has been funded by NIH, industry, and foundations. 

He has published >200 peer-reviewed articles since 2012. His published manuscripts include first- and senior-author publications in the journals, such as JAMA, JACI, JACC, AJRCCM, Annals of Emergency Medicine, and Pediatrics.  In addition to these original research papers, he has published more than 40 reviews, textbook chapters, and editorials.


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