About
Daniel O'Roark, DO, FACC, graduated from Philadelphia College of Osteopathic Medicine in 1984. He then completed an Internal Medicine residency at Grandview Hospital and Medical Center in Dayton, Ohio, finishing in 1987. Two years later, he completed his Cardiology Fellowship at St. Francis Medical Center in Pittsburgh, Pennsylvania.
Dr. O'Roark holds board certifications in cardiovascular diseases, internal medicine, echocardiography, and nuclear cardiology. The American College of Cardiology recognizes him as a Fellow. Over his 30-plus years in cardiology, he clinically directed and oversaw the accreditation of two nuclear cardiology labs. He holds licenses to practice in both Tennessee and Virginia. Patients consistently note his willingness to listen at length, explain results clearly, and follow up directly after hours. Dr. O'Roark founded Trinity Heart and Vascular Group to deliver comprehensive cardiovascular care at transparent prices, free from third-party interference.
Education & Training
Medical School
Philadelphia College of Osteopathic Medicine (1984)
Residency
Internal Medicine, Grandview Hospital and Medical Center, Dayton, OH (completed 1987)
Fellowship
Cardiology, St. Francis Medical Center, Pittsburgh, PA (completed 1989)
Certifications
Conditions Treated
Who is Dr. O'Roark right for?
Dr. O'Roark is well-suited for adults seeking direct access to a board-certified cardiologist without insurance delays. Patients managing conditions such as atrial fibrillation, coronary artery disease, heart failure, or hypertension benefit from his depth of experience. He also serves patients who need cardiac clearance for athletic competition or exercise programs, including children ages six and up. Those with high-deductible plans or no insurance find his transparent, flat-rate pricing especially practical. Patients who want extended appointment time and direct physician communication tend to thrive in his practice.
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Dr. O'Roark treats a wide range of cardiovascular conditions. These include hypertension, atrial fibrillation, coronary artery disease, congestive heart failure, valvular heart disease, cardiomyopathy, peripheral arterial disease, cardiac arrhythmias, pericardial disease, and pulmonary hypertension. He also provides follow-up care for patients recovering from a heart attack.
Yes. Dr. O'Roark holds board certifications in cardiovascular diseases, internal medicine, echocardiography, and nuclear cardiology. He also holds the designation of Fellow of the American College of Cardiology.
Dr. O'Roark completed his Internal Medicine residency at Grandview Hospital and Medical Center in Dayton, Ohio. He then trained in cardiology at St. Francis Medical Center in Pittsburgh, Pennsylvania, finishing his fellowship in 1989.
Dr. O'Roark brings more than 30 years of cardiology practice experience. During his career, he clinically directed and oversaw the accreditation of two busy nuclear cardiology labs.
Yes. Dr. O'Roark performs a full range of cardiac imaging at the Greeneville office. This includes comprehensive echocardiograms, ETT stress echocardiograms, pharmacological stress echocardiograms, carotid Doppler ultrasounds, and abdominal aortic aneurysm screenings.
Yes. Dr. O'Roark offers second opinions for patients who want an independent cardiovascular assessment. Patients do not need a referral to schedule an initial evaluation.
Yes. Dr. O'Roark performs cardiac risk assessments for athletic competition and exercise programs. He sees both adults and children starting at age six for these evaluations.
An initial patient evaluation with Dr. O'Roark runs approximately 60 minutes. He uses that time to conduct a comprehensive cardiac exam and review the patient's full cardiac health history.
Doctor profile last updated August 17, 2026