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Donald J. Hagler, Sr., M.D.

  1. Pediatric Cardiologist
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Departments

Specialty Groups

Location

  1. Rochester, Minnesota | Phoenix, Arizona

Languages

English

Existing patients

Appointments

Donald Joseph Hagler, M.D., is a consultant in the Division of Pediatric Cardiology, Department of Pediatrics, at Mayo Clinic in Rochester, Minnesota. He has been a member of the Mayo Clinic staff since 1975. Dr. Hagler provides care for infants, children, and adults with congenital heart conditions, focusing on helping individuals and families achieve long-term heart health. In addition to his clinical practice, he holds professorships in both Pediatrics and Medicine at Mayo Clinic College of Medicine and Science and serves as a member of the Circulatory System Devices Panel for the U.S. Food and Drug Administration.

Dr. Hagler's career reflects more than four decades of dedication to advancing cardiovascular care for children and adults with congenital heart disease. His extensive experience includes education, mentorship, and clinical innovation aimed at improving outcomes for those living with complex heart conditions.

Areas of expertise

Dr. Hagler provides comprehensive evaluation and treatment for children and adults with congenital or structural heart disease, emphasizing continuity of care across all ages.

  • Pediatric cardiology: Diagnosis and management of congenital and acquired heart conditions in infants and children
  • Adult congenital heart disease: Lifelong care for adults born with structural heart defects
  • Interventional cardiology collaboration: Works closely with interdisciplinary teams to evaluate and guide device and procedural therapies
  • Clinical education and mentorship: Training future generations in pediatric and congenital cardiology

Research and expertise

Dr. Hagler is board-certified in Pediatrics and Pediatric Cardiology by the American Board of Pediatrics and in Adult Congenital Heart Disease by the American Board of Internal Medicine. He completed fellowship training in pediatric cardiology at UCLA Medical Center and Mayo Clinic. His academic appointments include Professor of Pediatrics and Professor of Medicine at Mayo Clinic College of Medicine and Science, where he contributes to both clinical and translational science education. His service on the FDA's Circulatory System Devices Panel reflects his commitment to ensuring safety and innovation in cardiovascular care.

Personal note

Outside of medicine, Dr. Hagler enjoys flying and holds an instrument pilot's license.

  1. Atrial septal defect
  2. Atrioventricular septal defect
  3. Congenital heart disease
  4. Heart disease
  5. Patent ductus arteriosus
  6. Patent foramen ovale
  7. Tricuspid valve regurgitation
  8. Truncus arteriosus
  9. Ventricular septal defect
  1. Cardiac catheterization
  2. Echocardiogram
  3. Fetal echocardiogram
  4. Percutaneous valve procedure
  5. Transesophageal echocardiogram
  • Diagnostic congenital cardiac catheterization
  • Interventional congenital cardiac catheterization — intravascular stents
  • Interventional structural heart disease
  • Percutaneous cardiac valve implantation
  • Percutaneous catheter device closure of atrial septal defects, ventricular septal defects, patent foramen ovale, and patent ductus arteriosus
  • Echocardiography, fetal echocardiography, transesophageal and intracardiac echocardiography
  • Complex congenital heart disease
  • Three-dimensional echocardiography
  1. 1974
    ResidentPediatric Cardiology, Programs in Rochester, Mayo School of Graduate Medical Education, Mayo Clinic College of Medicine
  2. 1974
    Fellow - Pediatric CardiologyMayo Graduate School of Medicine, Mayo Clinic College of Medicine
  3. 1973
    Fellow - Pediatric CardiologyUCLA Medical Center, University of California, Los Angeles
  4. 1970
    Resident - PediatricsSt. Louis University Group Hospitals
  5. 1969
    Internship - PediatricsSt. Louis University Group Hospitals
  6. 1968
    MDSaint Louis University School of Medicine

Certifications

  1. 2015
    Adult Congenital Heart DiseaseAmerican Board of Internal Medicine
  2. 1975
    Pediatric CardiologyAmerican Board of Pediatrics
  3. 1974
    PediatricsAmerican Board of Pediatrics

Awards and honors

  1. 2024
    50 Year Service AwardMayo Clinic
  2. 2020
    Master of the Society of Cardiovascular Angiography and Interventions (MSCAI)Society for Cardiovascular Angiography and Intervention Scientific Sessions
  3. 2015
    Distinguished Pediatric Career AwardMayo Clinic
  4. 1996
    Distinguished Career AwardMayo Clinic

Professional memberships

  1. 2023 - present
    FellowPediatric and Congenital Interventional Cardiovascular Society (PICS)
  2. 2009 - 2011
    ChairSociety for Cardiovascular Angiography and Interventions Congenital Heart Disease Council
  3. 2008 - present
    MemberPediatric Drugs and Devices Workgroup, Pediatrics Oversight Committee, Mayo Clinic Center for Translational Science Activities
  4. 2007 - 2019
    Board MemberAmerican College of Pediatricians
  5. 2005 - 2007
    Editorial Board MemberAmerican Society of Echocardiography
  6. 2005 - 2006
    MemberWestern Society of Pediatric Cardiology
  7. 2004 - present
    FellowAmerican College of Pediatricians
  8. 2003 - present
    MemberSociety of Medical Consultants to the Armed Forces
  9. 2000 - present
    MemberSigma Xi, The Scientific Research Society
  10. 1999 - 2020
    FellowSociety for Cardiovascular Angiography and Interventions
  11. 1999 - 2007
    MemberMidwest Pediatric Cardiology Society
  12. 1999 - 2004
    MemberAssociation of Military Surgeons
  13. 1999 - present
    MSCAISociety for Cardiovascular Angiography and Interventions
  14. 1997
    MemberIntersocietal Commission for the Accreditation of Echocardiography Laboratories
  15. 1997
    MemberBoard of Directors, Intersocietal Commission for the Accreditation of Echocardiography Laboratories
  16. 1997 - present
    FellowAmerican Heart Association
  17. 1997 - present
    MemberAmerican College of Cardiology
  18. 1997 - present
    MemberBoard of Councilors, Minnesota Chapter, American College of Cardiology
  19. 1995 - 1999
    MemberResearch Medical Center
  20. 1989
    Vice ChairExecutive Committee, Section of Pediatric Cardiology, American Academy of Pediatrics
  21. 1988 - 1989
    PresidentSociety of Pediatric Echocardiography
  22. 1987 - 1999
    MemberQuality Assurance Consortium Committee, Pediatric Cardiac Care
  23. 1987
    Vice PresidentSociety of Pediatric Echocardiography
  24. 1987 - present
    Corresponding MemberAssociation of European Paediatric Cardiologists
  25. 1987 - present
    MemberAssociation of European Paediatric Cardiologists
  26. 1984 - 2006
    MemberSociety of Pediatric Echocardiography
  27. 1984
    TreasurerSociety of Pediatric Echocardiography
  28. 1984
    Board MemberAmerican Registry for Diagnostic Medical Sonography
  29. 1984
    MemberAmerican Registry for Diagnostic Medical Sonography
  30. 1980 - 2003
    MemberSociety for Pediatric Research
  31. 1976 - present
    FellowAmerican College of Cardiology
  32. 1975 - present
    MemberAmerican Academy of Pediatrics
  33.  
    Member3A Intensive Care Unit Committee, Mayo Clinic Rochester Committees
  34.  
    MemberTrip Committee, Mayo Clinic Committees
  35.  
    FellowAmerican Academy of Pediatrics
  36.  
    MemberAlpha Omega Alpha Honor Medical Society
  37.  
    MemberCouncil on Epidemiology, American Heart Association
  38.  
    MemberCouncil on Cardiovascular Disease in the Young, American Heart Association

Publications

Research activities

See a description of research activities.