Primary Care & Internal Medicine
Mary Elizabeth Callsen, MD
Johns Hopkins Community Physicians, Downtown Bethesda
Dr. Mary Elizabeth Callsen is an ABIM-certified internist with Johns Hopkins Community Physicians in Downtown Bethesda. She earned her medical degree at Ohio State University and completed residency at Brooke Army Medical Center.
Why patients choose Dr. Callsen
With one of the largest review counts on the Johns Hopkins system among local internists and a 4.9 rating, Dr. Callsen pairs sustained patient satisfaction with long clinical experience. Her Johns Hopkins profile notes Washingtonian Top Doctor recognition.
Practice focus
Comprehensive adult primary care within the Johns Hopkins Community Physicians network.
Profile last fact-checked June 23, 2026. Information reflects publicly available sources and may change. Confirm details directly with the practice before booking.
How Dr. Callsen compares
Context from the 139 providers we track across Bethesda and Montgomery County.
The only Ohio State University College of Medicine graduate we list
1 of the 107 doctors whose medical school we record studied at Ohio State University College of Medicine.
1 of 4 we list at Johns Hopkins Community Physicians, Downtown Bethesda
We cover 4 providers at Johns Hopkins Community Physicians, Downtown Bethesda.
Medical school: Ohio State University College of Medicine — Columbus, OH, United States.
Figures describe the 139 providers currently in the MyBethesdaDoctor registry as of August 2026 — a curated directory, not a census of every doctor in Montgomery County. How we build this list.
Where Dr. Callsen sits by experience
Dr. Callsen finished medical school in 1981, 45 years ago. Of the 135 providers in our registry whose graduation year we could verify, 9 finished earlier, 122 finished later, and 3 finished the same year.
1965–69
1 provider finished 1965–19691970–74
2 providers finished 1970–19741975–79
4 providers finished 1975–1979Dr. Callsen1981
1980–84
13 providers finished 1980–19841985–89
12 providers finished 1985–19891990–94
14 providers finished 1990–19941995–99
27 providers finished 1995–19992000–04
20 providers finished 2000–20042005–09
19 providers finished 2005–20092010–14
17 providers finished 2010–20142015–19
4 providers finished 2015–20192020–24
2 providers finished 2020–2024Among the 110 physicians we list, 9 finished medical school earlier — the median for that group is 1998.
All 12 bands
| Graduated | Providers |
|---|---|
| 1965–1969 | 1 |
| 1970–1974 | 2 |
| 1975–1979 | 4 |
| 1980–1984 — Dr. Callsen | 13 |
| 1985–1989 | 12 |
| 1990–1994 | 14 |
| 1995–1999 | 27 |
| 2000–2004 | 20 |
| 2005–2009 | 19 |
| 2010–2014 | 17 |
| 2015–2019 | 4 |
| 2020–2024 | 2 |
Figures describe the 139 providers currently in the MyBethesdaDoctor registry as of August 2026 — a curated directory, not a census of every doctor in Montgomery County. Based on the 135 of 139 profiles with a graduation year we could verify against a primary source; the remaining 4 are left out rather than estimated. How we build this list.
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