About
Dr. Thomas McNamara earned his Bachelor of Arts in Biology from The Catholic University of America in 1975, graduating as a member of the Sigma Xi Honor Society. He went on to complete his Doctorate of Medicine at Georgetown University School of Medicine in 1981. He then completed both his internship and internal medicine residency at the University of Cincinnati, finishing in 1984.
Since that same year, Dr. McNamara has served as an Associate Professor in Clinical Medicine at Georgetown University School of Medicine. He holds certification as a Diplomate of the National Board of Medical Examiners. His clinical interests include cardiovascular disease, diabetes, hypertension, and preventive medicine. Over nearly 25 years in the Bethesda community, his philosophy has evolved toward prevention as the foundation of health. He now focuses on stopping disease before it develops, not just treating it after the fact. Washingtonian Magazine has named him a Top Doctor continuously since 1998, and Checkbook Magazine followed with the same recognition starting in 2010.
Education & Training
Undergraduate
The Catholic University of America, Bachelor of Arts, Biology, 1975
Medical School
Georgetown University School of Medicine, Doctorate of Medicine 1981
Residency
Internal Medicine, University of Cincinnati, 1982-1984
Additional Training
Internship, University of Cincinnati, 1981-1982; Associate Professor, Georgetown University School of Medicine, Faculty in Clinical Medicine 1984-present
Certifications
Conditions Treated
Who is Dr. McNamara right for?
Dr. McNamara serves adults who want a physician invested in long-term, preventive care. Patients managing cardiovascular disease, diabetes, or hypertension benefit most from his clinical focus. He works well with patients who have specific health goals, whether athletic, nutritional, or medication-related. Adults who value 24/7 physician access and same-day appointments will find his practice a strong match. His network of community specialists also makes him a good fit for patients with complex or layered health needs.
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Frequently Asked Questions
Dr. McNamara specializes in internal medicine with a strong focus on cardiovascular disease, diabetes, and hypertension. He also emphasizes preventive medicine across all of his patient care. He works with patients to address current health problems while actively working to prevent new ones from developing.
Dr. McNamara builds individualized healthcare plans with each patient. He works alongside patients to help them make informed decisions toward their personal health goals. Those goals might include running a first marathon, improving nutrition, or reducing medication use. He views prevention as the foundation of true health.
Dr. McNamara earned his medical degree from Georgetown University School of Medicine in 1981. He completed his internship and internal medicine residency at the University of Cincinnati between 1981 and 1984. He has also served on the Georgetown faculty as an Associate Professor in Clinical Medicine since 1984.
Dr. McNamara holds certification as a Diplomate of the National Board of Medical Examiners. He practices internal medicine and brings decades of clinical experience in preventive care, cardiovascular disease, diabetes, and hypertension.
Yes. Washingtonian Magazine has named Dr. McNamara a Top Doctor every year since 1998. Checkbook Magazine has recognized him as a Top Doctor continuously since 2010. He has practiced medicine in the Bethesda community for nearly 25 years.
Dr. McNamara sees his patients directly at every office visit. The MDVIP model does not substitute nurse practitioners or physician assistants for scheduled appointments. When you come to the office, you see Dr. McNamara.
Yes. Dr. McNamara is reachable by phone after hours and on weekends. Members can contact him directly for urgent concerns outside of regular office hours. This level of access is a core feature of his MDVIP practice.
Dr. McNamara holds affiliations with Suburban Hospital and Shady Grove Adventist Hospital, both in the greater Washington, DC area. These affiliations support continuity of care for patients who need hospital-level services.
Doctor profile last updated April 11, 2026