About
Harry A. D. trained at the University of Maryland School of Medicine and has built a career centered on relationship-driven primary care and internal medicine. He founded his solo retainer-based practice in Columbia, Maryland in 2011, keeping his panel deliberately small to sustain close, personal attention for every patient. He serves as an Adjunct Professor of Medicine at the University of Maryland School of Medicine.
Dr. Oken gives patients direct access to his cell phone around the clock and responds to email for non-urgent needs. He remains one of only a few Howard County primary care physicians who continues to see patients admitted to Howard County General Hospital, providing daily oversight with the hospitalist team and coordinating with emergency room physicians when urgent situations arise. He is deeply interested in tick-borne illnesses and collaborated with Dr. Aucott, Director of the Lyme Center of Johns Hopkins, on a patient education video about Lyme disease. Dr. Oken participates in the BOOM High Intensity Interval Training program at Columbia Gym in Clarksville and co-hosts the "Finding Your Wellness" podcast with Howard Community College and the Columbia Association. He has written more than 130 health newsletters for his patients, covering topics from infectious disease to everyday wellness.
Education & Training
Additional Training
Adjunct Professor of Medicine, University of Maryland School of Medicine
Conditions Treated
Who is Dr. Oken right for?
Dr. Oken suits adults who want a primary care physician involved at every stage of their health, including hospital stays and emergency situations. Patients managing chronic conditions benefit from his commitment to continuity across all care settings. Those with concerns about tick-borne illnesses, including Lyme disease and Rocky Mountain Spotted Fever, will find a physician with focused expertise in this area. Patients who value direct, around-the-clock access to their doctor and a long-term personal relationship will feel at home in this practice.
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Frequently Asked Questions
Dr. Oken focuses on primary care and internal medicine with a broad scope that includes infectious diseases such as Lyme disease, Rocky Mountain Spotted Fever, COVID-19, influenza, RSV, and measles. He has a particular clinical interest in tick-borne illnesses and collaborated with Dr. Aucott, Director of the Lyme Center of Johns Hopkins, on a patient education video about Lyme disease.
Yes. Dr. Oken is one of only a few primary care physicians in Howard County who continues to see his patients after a hospital admission. When a patient enters Howard County General Hospital, Dr. Oken visits daily and works alongside the hospitalist team to oversee their care throughout the stay.
Dr. Oken coordinates directly with emergency room physicians at the local emergency room when a patient needs immediate care. Patients should call 911 first in a true emergency, then contact Dr. Oken on his cell phone so he can engage with the treating team on their behalf.
Yes. Dr. Oken gives his patients direct access to his personal cell phone 24 hours a day, seven days a week. He also stays available by email for questions that do not require an immediate response.
Dr. Oken earned his medical degree from the University of Maryland School of Medicine. He currently serves as an Adjunct Professor of Medicine at the same institution, maintaining an active connection to medical education alongside his clinical practice.
Yes. Dr. Oken participates in the BOOM High Intensity Interval Training program at Columbia Gym in Clarksville. He also co-hosts the "Finding Your Wellness" podcast in partnership with Howard Community College and the Columbia Association, covering a wide range of wellness topics for the community.
Dr. Oken has published more than 130 health newsletters covering news, advice, and updates on topics ranging from infectious disease to general wellness. He sends these newsletters directly to his patients and maintains an archive on his practice website.
Dr. Oken sees adult patients seeking primary care and internal medicine in Howard County. He suits patients who want a physician available around the clock, involved during hospitalizations, and focused on long-term continuity of care across all health situations.
Doctor profile last updated June 11, 2026