About
Dr. Brendan Sullivan is a board-certified cardiologist and internist practicing in Clifton and Ridgewood, New Jersey. He earned his Bachelor of Arts of Sciences in Classics from Georgetown University College in 1991, followed by a Master of Science in Physiology from Georgetown University Graduate School in 1992. He then completed his Doctorate of Medicine at St. George's University School of Medicine in Grenada, West Indies in 1998. His internship and internal medicine residency took him to St. Luke's Roosevelt Hospital Center in New York. He completed his fellowship in Cardiovascular Disease at Albany Medical Center in Albany, New York, finishing in 2004.
Dr. Sullivan holds board certification through the American Board of Internal Medicine in Cardiovascular Disease and also carries certification from the Nuclear Board of Cardiology. He is a Fellow of the American College of Cardiology and earned Top Doc honors each year from 2016 through 2021. His clinical interests include atrial fibrillation management, anticoagulation decisions, and antiarrhythmic therapy. He runs the Ideal Protein ketogenic diet program in his office to support physician-guided weight loss. Dr. Sullivan speaks medical Spanish, and his staff serves patients fluent in Spanish and Polish. He also serves as an attending cardiologist at Valley Hospital in Ridgewood.
Education & Training
Undergraduate
Georgetown University College, Bachelor of Arts of Sciences, Classics, 1991
Medical School
St. George's University School of Medicine, Grenada, West Indies, Doctorate of Medicine 1998
Residency
Internal Medicine, St. Luke's Roosevelt Hospital Center, New York, NY, 1999-2001
Fellowship
Cardiovascular Disease, Albany Medical Center, Albany, NY, 2001-2004
Additional Training
Georgetown University Graduate School, Master of Science, Physiology, 1992; Internship at St. Luke's Roosevelt Hospital Center, New York, NY, 1998-1999
Certifications
Languages
English, Spanish
Conditions Treated
Who is Dr. Sullivan right for?
Dr. Sullivan is a strong fit for adults who want primary care delivered by a cardiologist. Patients managing hypertension, heart disease, or cardiovascular risk benefit from his dual expertise. He also works well with patients seeking physician-guided weight loss through a structured ketogenic program. Spanish-speaking patients and those whose families speak Polish will find his practice especially accessible.
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Frequently Asked Questions
Dr. Sullivan focuses on cardiovascular disease, hypertension, heart disease, and weight management. He has a particular interest in atrial fibrillation, including decisions around anticoagulation and antiarrhythmic therapy. His internal medicine training also lets him address a broad range of primary care needs alongside these cardiac concerns.
Yes. Dr. Sullivan holds board certification through the American Board of Internal Medicine in Cardiovascular Disease. He also carries certification from the Nuclear Board of Cardiology and holds fellowship status in the American College of Cardiology.
Dr. Sullivan completed his fellowship in Cardiovascular Disease at Albany Medical Center in Albany, New York, from 2001 to 2004. Before that, he completed his internal medicine residency at St. Luke's Roosevelt Hospital Center in New York.
Yes. Dr. Sullivan performs echocardiography, stress testing, and vascular testing directly in his office. This allows patients to access non-invasive cardiac screening without a separate referral visit.
Dr. Sullivan uses non-invasive cardiology screening to detect problems early. He pairs advanced diagnostic testing with the MDVIP Annual Wellness Program to build personalized healthcare plans. His goal is to help patients reach specific health targets through proactive monitoring and lifestyle planning.
Yes. Dr. Sullivan runs the Ideal Protein ketogenic diet program in his office. This physician-guided program supports structured weight loss with direct medical oversight.
Dr. Sullivan speaks medical Spanish. His staff also includes members fluent in Spanish and Polish, making the practice accessible to a multilingual patient population.
Yes. Dr. Sullivan remains on staff as an attending cardiologist at Valley Hospital in Ridgewood, New Jersey. He can also help manage care for patients who require hospitalization.
Dr. Sullivan sees patients at two locations: his primary office in Clifton, New Jersey, and a second office in Ridgewood, New Jersey.
Yes. Dr. Sullivan earned Top Doc recognition every year from 2016 through 2021. He is also a Fellow of the American College of Cardiology.
Doctor profile last updated April 11, 2026