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Margaret M Brennan, M.D.

Photo of Dr. Margaret M Brennan, M.D.
  • Director, Noninvasive Cardiology at GBMC
  • Assistant Professor of Medicine


Cardiovascular Disease, Cardiovascular Diseases, Clinical Cardiology, Echocardiography, General Cardiology, Heart Disease, Heart Failure, Hypertension, Valvular Heart Disease more

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Johns Hopkins Cardiology - GBMC

Appointment Phone: 443-997-0270
6569 North Charles Street
Suite 600
Towson, MD 21204 map
Phone: 443-849-8989 | Fax: 443-849-8988


Dr. Margaret M. Brennan is an assistant professor of medicine at The Johns Hopkins University School of Medicine. She is also a cardiovascular physician and director of noninvasive cardiology at the Greater Baltimore Medical Center. She was named a U.S. News and World Report Top Doctor in 2012. 

Dr. Brennan received her undergraduate degree in biology from Williams University. She earned a medical degree from Vanderbilt University School of Medicine before completing a masters of health science from the Johns Hopkins School of Hygiene and Public Health.  She completed a residency at Vanderbilt University Hospital, where she was awarded chief resident 1985-1986. Dr. Brennan joined the Johns Hopkins as a fellow in 1986. 

Dr. Brennan is a member of the American Society of Echocardiography and a fellow with the American College of Physicians. Her work has been recognized most recently through being awarded Baltimore Magazine’s “Top Docs” Cardiology in 2014 and 2015. more


  • Director, Noninvasive Cardiology at GBMC
  • Assistant Professor of Medicine

Departments / Divisions

Centers & Institutes



  • MD, Vanderbilt University School of Medicine (1981)


  • Vanderbilt University School of Medicine / Internal Medicine (1984)
  • Vanderbilt University School of Medicine / Internal Medicine (1986)


  • Royal College of Surgeons in Ireland / Clinical Pharmacology (1985)
  • Johns Hopkins University School of Medicine / Cardiology (1989)

Board Certifications

  • American Board of Internal Medicine / Cardiovascular Disease (1989)
  • American Board of Internal Medicine / Internal Medicine (1986)

Research & Publications

Activities & Honors


  • U.S. News and World Report, named “Top Doctor” 2012
  • Baltimore Magazine “Top Docs” Cardiology November 2014, November 2015.


  • American College of Cardiology, Fellow
  • American College of Physicians, Fellow
  • American Heart Association, Clinical Cardiology Council
  • American Society of Echocardiography

Professional Activities

  • National Board of Echocardiography, 2006

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

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