About
Dr. B. Grant Marshall grew up in Virginia and earned a Bachelor of Science in Biology at James Madison University. He went on to Eastern Virginia Medical School, where faculty recognized him with the Gold Humanism in Medicine award for compassionate, patient-centered care. He completed his Family Medicine residency at St. Vincents Medical Center, part of Ascension Health, in Jacksonville, Florida.
After residency, Dr. Marshall practiced family medicine within the Ochsner Health system in New Orleans. He later joined the faculty at the University of Queensland as an Associate Professor, spending significant time training the next generation of clinicians. He and his wife, Dr. M. Brittany Marshall, co-founded Mission Family Medicine in Titusville. Dr. Marshall treats a wide range of conditions, including hypertension, diabetes, asthma, arthritis, and mental health concerns. He supports Titusville's student athletes through care at high school sporting events and co-leads twice-yearly medical mission trips to Colombia through Mission Global Ministries.
Education & Training
Undergraduate
James Madison University, B.S. Biology
Medical School
Eastern Virginia Medical School
Residency
Family Medicine, St. Vincents Medical Center (Ascension Health), Jacksonville, FL
Additional Training
Associate Professor, University of Queensland; practiced at Ochsner Health system, New Orleans, LA
Conditions Treated
Who is Dr. Marshall right for?
Dr. Marshall is a strong fit for adults and children managing chronic conditions such as hypertension, diabetes, asthma, or allergies. Patients who want a physician with deep academic and clinical experience will find his background compelling. He also serves student athletes well, given his involvement with high school athletics in Titusville. His concierge membership option suits patients who want direct physician access and same-day availability.
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Frequently Asked Questions
Dr. Marshall treats hypertension, diabetes, allergies, asthma, arthritis, mental health issues, digestive concerns, and joint and muscle injuries. He manages both acute and chronic conditions for patients of all ages, including children.
Dr. Marshall earned his medical degree at Eastern Virginia Medical School. He completed his Family Medicine residency at St. Vincents Medical Center, an Ascension Health facility, in Jacksonville, Florida. He later practiced at Ochsner Health in New Orleans and served as an Associate Professor at the University of Queensland.
Dr. Marshall holds a Doctor of Medicine degree and specializes in family medicine. He earned the Gold Humanism in Medicine award during medical school for his patient-centered approach to care.
Yes, Dr. Marshall cares for patients of all ages, including newborns and children. Mission Family Medicine offers pediatric care alongside adult care, so the whole family can see the same physician team.
Dr. Marshall actively supports Titusville's high school athletics program by providing medical care at events. He also co-leads twice-yearly medical mission trips to Colombia, providing healthcare to Venezuelan refugees through Mission Global Ministries.
Yes. Mission Concierge Care members receive Dr. Marshall's cell phone number and can contact him directly by text, call, or email. Enrollment for Mission Concierge Care opens in April 2025.
Yes. Dr. Marshall and the Mission Family Medicine team favor exercise, dietary improvements, and natural compounds before prescribing medications. He practices evidence-based medicine and focuses on identifying the root causes of health concerns.
Doctor profile last updated June 9, 2026