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Aaron B. Klassen, M.D., M.A.


  1. Rochester, Minnesota



Aaron Klassen, M.D., M.A. is an Emergency Physician and EMS Physician. Dr. Klassen primarily practices in the Emergency Department at St Mary's Hospital in Rochester, MN, but also works in several Mayo Clinic Health System emergency departments in Minnesota and Wisconsin. He also provides Emergency Telemedicine support to emergency physicians, nurse practitioners and physician assistants working in many emergency departments in Minnesota, Wisconsin and Iowa.

As an EMS Physician, Dr. Klassen works as a medical director for several ambulance services, fire departments and other first responders in Minnesota and Wisconsin. He is also one of several EMS Physicians who respond to emergencies alongside paramedics, EMTs, firefighters and police officers as part of Mayo Clinic's Physician Field Response Program.

  1. 2020
    Fellow - Emergency Medical ServicesRegions Hospital
  2. 2019
    ResidentEmergency Medicine, Programs in Rochester, Mayo School of Graduate Medical Education, Mayo Clinic College of Medicine
  3. 2016
    MDUniversity of Arizona College of Medicine, Phoenix
  4. 2012
    MA - Applied Biomedical and Health EthicsArizona State University
  5. 2006
    BA - LinguisticsUniversity of Arizona
  6. 2006
    BS - Molecular and Cellular BiologyUniversity of Arizona


  1. 2021
    Emergency MedicineAmerican Board of Emergency Medicine

Awards and honors

  1. 2019
    Emergency Department Resident Educator of the QuarterMayo Clinic
  2. 2015
    Gold Humanism AwardArnold P. Gold Humanism in Medicine Honor Society
  3. 2009
    Chief of Police Citation of ExcellenceTucson Police Department

Professional memberships

  1. 2022 - present
    FellowAcademy of Emergency Medical Services
  2. 2022 - present
    FellowAmerican College of Emergency Physicians
  3. 2022 - present
    SecretaryNational Association of EMS Physicians, Minnesota Chapter
  4. 2017 - present
    MemberNational Association of EMS Physicians
  5. 2014 - present
    MemberAmerican College of Emergency Physicians
  6. 2013 - 2014
    Chair, Medical Student GovernmentUniversity of Arizona College of Medicine - Phoenix
  7. 2012 - present
    MemberAmerican Medical Association