“Medicine is constantly evolving and changing with new treatments and therapies. It is important to practice evidence-based medicine whenever possible. It is my goal to continuously seek knowledge and a better understanding. Medical decision making is a shared process between physician and patient. I believe that the keys to success in medicine are ensuring that physicians truly listen to their patients, establish a personal connection and care for the person, not a disease.”

Board Certification

  • Internal Medicine

Areas of Expertise

  • Cardiovascular Disease
  • Chronic Disease Management
  • Immediate Care
  • Travel Health


Internship and Residency

Walter Reed Army Medicine Center
Internal Medicine
Washington, DC
2009 and 2011

Medical School

Nova Southeastern University College of Osteopathic Medicine
Doctor of Osteopathic Medicine
Fort Lauderdale, FL

Undergraduate School

Boston University
Bachelor of Science in Human Physiology
Boston, MA

Hospital Affiliated With

Virginia Hospital Center

Professional Associations

American College of Physicians
2011 – Present

Fort Belvoir Community Hospital
Hospitalist Service Chief
2013 – 2015

Urgent Care Association of America
2014 – Present

Academic Appointment

Walter Reed National Military Medical Center
Clinical Instructor of Internal Medicine

Personal Interests

Dr. Duffy resides in Great Falls, Virginia. He enjoys reading, international travel, tennis, sailing and spending quality time with his wife and children.


A native of New Hampshire, Dr. Sean P. Duffy joined Pulmonary and Medical Associates of Northern Virginia in 2016. After graduating from Boston University with a B.S. in Human Physiology, Dr. Duffy pursued his medical education at Nova Southeastern University College of Osteopathic Medicine. He then joined the US Army and completed Internal Medicine residency at Walter Reed Army Medical Center. He served as the Army physician in charge of the wounded warrior program and was Fort Belvoir’s Hospitalist Service Chief. After Dr. Duffy transitioned to civilian medicine his areas of practice have included Primary Care and Immediate Care.

Dr. Duffy was the coordinating physician for the wounded warriors coming back from OIF/OEF from 2011 to 2013 in Fort Belvoir, Virginia. He treated Soldiers that were wounded, ill or injured. His mission was to treat, rehabilitate and facilitate returning a Soldier back to duty.