About
Mark H. Gregory, MD, FACP, is a board-certified internist practicing concierge medicine in Saint Louis, Missouri. He earned his Bachelor of Arts in Zoology from the University of Vermont in 1982 and his Doctorate of Medicine from the University of Vermont College of Medicine in 1986. He completed his Internal Medicine residency at West Suburban Hospital Medical Center in Oak Park, Illinois.
Dr. Gregory holds fellowship status in the American College of Physicians. Since 2012, he has served as a Voluntary Assistant Professor of Clinical Medicine at Washington University School of Medicine. He also instructs in both the ACES and CAER programs there. His professional distinctions include recognition in Best Doctors in America every year since 2006. He earned the United States Air Force Achievement Medal for Expeditionary Medical Support in 2013, reflecting his military service as a Lieutenant Colonel and Flight Surgeon with the Illinois Air National Guard. He served as Chief of Staff of the 126th Medical Group and as Medical Director of the Vaccination Program at Scott AFB. Outside medicine, he pursues fly fishing and aviation.
Education & Training
Undergraduate
University of Vermont, Bachelor of Arts, Zoology 1982
Medical School
University of Vermont College of Medicine, Doctorate of Medicine 1986
Residency
Internal Medicine, West Suburban Hospital Medical Center, Oak Park, IL 1986-1989
Additional Training
Voluntary Assistant Professor of Clinical Medicine, Washington University School of Medicine 2012-present; Instructor, ACES Program and CAER Program, Washington University School of Medicine
Certifications
Who is Dr. Gregory right for?
Dr. Gregory is a strong fit for adults seeking a long-term relationship with a dedicated internist. Patients managing chronic conditions such as hypertension, high cholesterol, or type 2 diabetes benefit from his preventive focus. He works well with patients who want direct physician access, including after-hours and weekend availability. Those who value comprehensive annual wellness screenings and a personalized health plan will find his approach well-matched to their needs.
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Frequently Asked Questions
Dr. Gregory specializes in internal medicine, with a strong emphasis on preventive care and chronic disease management. He focuses on conditions including hypertension, high cholesterol, and type 2 diabetes. His practice incorporates comprehensive annual screenings and custom wellness planning for each member.
Yes. Dr. Gregory holds board certification from the American Board of Internal Medicine. He also holds fellowship status in the American College of Physicians, a distinction recognizing professional achievement and commitment to the field.
Dr. Gregory earned his medical degree from the University of Vermont College of Medicine in 1986. He completed his Internal Medicine residency at West Suburban Hospital Medical Center in Oak Park, Illinois, finishing in 1989.
Yes. Dr. Gregory makes himself available by phone after hours and on weekends. Members have reached him during evenings, weekends, and even while he was traveling on military duty. He responds personally, not through a nurse line or answering service.
Yes. Dr. Gregory maintains affiliations with Barnes-Jewish Hospital and Missouri Baptist Medical Center. These affiliations allow him to coordinate hospital-based care directly for his patients when needed.
Dr. Gregory believes time and listening are the most important tools a physician has. He treats each patient as a friend and an advocate relationship, not just a clinical encounter. He also helps patients navigate complex healthcare decisions and specialist referrals.
Yes. Dr. Gregory has served as a Voluntary Assistant Professor of Clinical Medicine at Washington University School of Medicine since 2012. He also instructs medical students and residents through the ACES and CAER programs at Washington University.
Yes. Best Doctors in America has recognized Dr. Gregory every year since 2006. He also received the United States Air Force Achievement Medal for Expeditionary Medical Support in 2013 for his service as a Flight Surgeon with the Illinois Air National Guard.
Dr. Gregory sees adult patients seeking comprehensive primary care and preventive medicine. His members include patients managing chronic conditions, those focused on long-term wellness, and individuals who want direct, unhurried access to their physician.
Doctor profile last updated April 9, 2026