Steven Stubblefield is a Cardiologist in Chattanooga,, Tennessee. Dr. Stubblefield is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Angina, Unstable Angina, Atherosclerosis, Heart Bypass Surgery, and Pacemaker Implantation.

Dr. Andrew Fowler is a cardiologist at The Chattanooga Heart Institute. He is board-certified in internal medicine, cardiovascular diseases, and interventional cardiology. Dr. Fowler completed his fellowship in cardiology at the Medical University of South Carolina, where he also pursued advanced training in interventional cardiology. Prior to that, he completed his internship and residency in internal medicine at the University of Alabama at Birmingham. He graduated magna cum laude from Furman University with a B.S. in chemistry and a B.A. in music. With a patient-centered approach, Dr. Fowler believes in a shared decision-making process with his patients. His goal is to help patients achieve longer lives and allow for a better quality of life. He was inspired to become a physician so that he could be with others in their time of need and finds great fulfillment in fostering meaningful relationships with his patients.He is particularly drawn to the anatomy, physiology, and hemodynamics of cardiology, and is excited about the advancements in the field that help patients feel better and live longer. Dr. Fowler was instrumental in integrating fractional flow reserve, a technique which improves the ability to see the significance of a blockage, into catheterizations in Chattanooga. He views advancements in imaging technology as a significant evolution in his field, which makes for better decision-making and allows patients to avoid unnecessary procedures.Outside of work, Dr. Fowler enjoys spending time with his wife, creating music with loved ones, and playing pickleball. Dr. Fowler is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Angina, Atrial Fibrillation, and Heart Bypass Surgery.

Dr. Stephen Monroe earned his medical degree from the University of South Florida College of Medicine at Tampa and completed his internship, internal medicine residency, and cardiology and interventional cardiology fellowships at the University of Florida College of Medicine in Gainesville. He held the position of assistant professor of medicine in the Division of Cardiology at the University of Florida College of Medicine.Dr. Monroe was one of the first cardiologists in this area to perform radial catheterizations. Currently, Dr. Monroe is involved in a number of cardiology research studies either as principal investigator, co-investigator or sub-investigator, or protocol co-author. The studies range from establishing condition-specific treatment guidelines to examining the safety and efficacy of pharmacological treatments. He is also currently participating in ongoing clinical trials.Dr. Monroe has been published in the American Heart Association’s journal, Circulation, as well as in Progress in Cardiovascular Diseases, The Journal of the American College of Cardiology, The Journal of Heart and Lung Transplantation, and The American Heart Journal.|He has co-authored chapters in the books Cardiology and Cardiovascular Therapeutics, A Companion to Braunwald’s Heart 2nd Edition and has presented before the members of the Society for Cardiac Angiography and Interventions. Dr. Monroe is board certified in cardiology and is a member of the Chattanooga-Hamilton County Medical Society.Dr. Monroe is an avid hiker. He and his family enjoy many outdoor activities. Dr. Monroe is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Angina, Coronary Heart Disease, Atherosclerosis, Heart Bypass Surgery, and Advanced Bronchoscopy.

Dr. William (Bill) Warren is a cardiologist specializing in non-invasive and imaging cardiology. He is board-certified in Internal Medicine, Cardiovascular Disease, Nuclear Cardiology, and Echocardiography. Dr. Warren graduated summa cum laude from Princeton University, earned his Doctor of Medicine degree at Harvard Medical School, completed his internal medicine internship and residency at Massachusetts General Hospital, and finished a cardiology fellowship at Johns Hopkins Hospital. His areas of focus include a wide range of cardiovascular conditions and treatments, with expertise in non-invasive diagnostic studies.Since joining The Chattanooga Heart Institute in 2003, Dr. Warren has become a valued leader at CHI Memorial and in the Chattanooga medical community. He currently serves as managing partner of The Chattanooga Heart Institute, where he collaborates with over 30 colleagues. He previously chaired the CHI Memorial Board of Directors.Dr. Warren possesses a broad range of clinical interests and expertise. His dedication to patient care stems from a deep love of science combined with a genuine ability to connect with patients on a personal level. The complexity and diverse treatment options within cardiovascular care drew him to this field, allowing him to help critically ill patients recover and thrive. He was the recipient of CHI Memorial’s inaugural St. Luke’s Healer’s Heart award which recognizes physicians and providers for demonstrating compassion, inclusion, integrity, excellence and collaboration.Dr. Warren's commitment extends beyond clinical practice. He has conducted research studies which have been published in prestigious journals including the American College of Cardiology Current Journal Review, Circulation, Journal of Infectious Diseases, Journal of Clinical Microbiology, and Journal of Clinical Research.Away from work, Dr. Warren enjoys nature photography and travel. He has visited all seven continents. Dr. Warren is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Angina, Pacemaker Implantation, and Heart Bypass Surgery.

Dr. Mark Thel graduated with Distinction from the University of Virginia and cum laude from Georgetown University School of Medicine. At Georgetown, he was president of the Honor Medical Society Alpha Omega Alpha. He served his internship, internal medicine residency, cardiology fellowship, and interventional training at Duke where he was also the Chief Resident in the Department of Medicine. He received the Duke Medical School Davison Society teaching award in 1996.Dr. Thel has published more than 25 papers focusing on clinical trials in interventional cardiology. Dr. Thel participated in the United States Navy Health Professions Scholarship Program and left the Navy in 2000 as a Commander. His duty stations included General Medical Officer for Carrier Air Group Five in Atsugi, Japan, and staff cardiologist at the National Naval Medical Center in Bethesda, MD. Dr. Thel is a Diplomate of the National Board of Medical Examiners and is board certified in internal medicine, cardiology and interventional cardiology. He is a Fellow of the American College of Cardiology. Dr. Thel is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Angina, Aortic Valve Replacement, and Transcatheter Aortic Valve Replacement (TAVR).

Dr. Allen Atchley is board certified in Internal Medicine and Cardiovascular Diseases and also holds specialized board certifications in Echocardiography, Nuclear Cardiology and is a Registered Physician in Vascular Interpretation, Vascular Ultrasound. He completed his fellowship in cardiology at Duke University Medical Center where he further pursued advanced training with a specialized fellowship in non-invasive cardiovascular imaging. Dr. Atchley also completed his internship and residency in Internal Medicine at Duke.Dr. Atchley performed the first 3D Transesophageal Echo (TEE) in Chattanooga in March of 2011 and is one of only a few cardiologists level 3 trained in echocardiography and nuclear cardiography in the area. While at Duke University, he participated in research focused on echo and nuclear cardiology.Dr. Atchley and his wife have four young children—twin girls, a daughter one year younger and the youngest, a son. His leisure time is spent enjoying activities with his family. Dr. Atchley is a former All-American golfer. Dr. Atchley is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Mitral Valve Regurgitation, Coronary Heart Disease, Atherosclerosis, Heart Bypass Surgery, and Pacemaker Implantation.

Dr. William F. Oellerich earned his medical degree from the University of Tennessee at Memphis while concurrently earning a doctorate in philosophy in its Department of Pharmacology. He completed his internship and residency in internal medicine and served as chief resident at Barnes-Jewish Hospital at the Washington University School of Medicine in St. Louis, Missouri. He also completed his fellowship in cardiology at Washington University School of Medicine.Dr. Oellerich is board certified in cardiology and echocardiography. He has had specialized training in nuclear cardiology, diagnostic cardiac catheterization, cardiac magnetic resonance imaging, autonomic pharmacology, cardiovascular pharmacology, and echocardiography. He has been published in the American Journal of Roentgenology, Neuroscience and The Journal of Pharmacology and Experimental Therapeutics.He is the director of the echocardiography lab and CT cardiovascular program at Memorial Hospital. He plays an instrumental part in the ongoing progress of the cardiovascular CT program. He is helping to coordinate the introduction of a valve clinic to The Chattanooga Heart Institute. Dr. Oellerich is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Aortic Valve Stenosis, and Angina.

Dr. Vimal Ramjee is board certified in cardiovascular diseases, internal medicine, echocardiography, cardiac CT, and advanced cardiovascular life support. He has received advanced specialty training in transthoracic echocardiography, transesophageal echocardiography and stress echocardiography.He completed a fellowship in cardiovascular disease and advanced cardiovascular imaging and translational research at the Hospital of the University of Pennsylvania in Philadelphia. Dr. Ramjee completed his residency in internal medicine at Emory Hospital in Atlanta. He received his medical degree from Mount Sinai School of Medicine in New York and two Bachelor of Science degrees from Emory University in Atlanta. He has received numerous academic honors and awards. Dr. Ramjee is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Atrial Fibrillation, Mitral Valve Regurgitation, Aortic Regurgitation, Coronary Heart Disease, and Heart Bypass Surgery.

Dr. Ondrej Lisy completed his internship and internal medicine residency at the Mayo Clinic College of Medicine in Rochester, MN. Also at the Mayo Clinic in Rochester, he completed his fellowship in cardiovascular diseases with the clinician investigator track which was followed by additional fellowship training in cardiac imaging. He received his medical degree and Ph.D. degree in cardiovascular physiology from Charles University in Prague, Czech Republic, prior to accepting the Assistant Professor of Medicine position at the Mayo Medical School.He received numerous awards while at the Mayo Clinic including the Young Investigator Award of the Heart Failure Society of America and the American College of Physicians and Donald C. Balfour Award of the Mayo Clinic Alumni Association for Meritorious Research. Dr. Lisy has been published in numerous medical journals including Circulation, Journal of the American College of Cardiology, Hypertension, American Journal of Physiology and Kidney International. Dr. Lisy has been involved in cutting edge research on heart failure for many years including designing peptides for heart failure treatment.Dr. Lisy has expertise in noninvasive cardiology and cardiac imaging modalities after he did his advanced specialty training in nuclear cardiology and echocardiography. He has been instrumental in establishing the Cardiac PET Program at Memorial Hospital where he has served since 2018 as the medical director of the Nuclear Cardiology Laboratory. Dr. Lisy is board certified in cardiology, internal medicine and nuclear cardiology. He is a Fellow of the American College of Cardiology. Dr. Lisy is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Mitral Valve Regurgitation, Necrosis, Arterial Embolism, Coronary Heart Disease, and Heart Bypass Surgery.

Lisa Carkner is a Cardiologist in Chattanooga, Tennessee. Dr. Carkner is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. Her top areas of expertise are Mitral Valve Regurgitation, Necrosis, Aortic Regurgitation, Coronary Heart Disease, and Pacemaker Implantation. Dr. Carkner is currently accepting new patients.

Dr. Robert Huang is board certified in Internal Medicine and Cardiovascular Diseases and specializes in interventional cardiology. He completed fellowships in cardiology and interventional cardiology at Vanderbilt University Medical Center where he also earned a Masters of Public Health. He earned his Doctor of Medicine degree at Case Western Reserve University School of Medicine where he also earned a Bachelor of Science in Biomedical Engineering.Dr. Huang served his internal medicine internship and residency at Vanderbilt University Medical Center. He served as Clinical Assistant Professor at the University of Tennessee College of Medicine at Chattanooga. Dr. Huang has practiced cardiology in Chattanooga since 2011 and is the author of numerous professional papers in the field of cardiology. Dr. Huang is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Heart Attack, Angina, Coronary Heart Disease, Heart Bypass Surgery, and Angioplasty.

Dr. Lehman is board certified in Cardiovascular Disease and specializes in imaging cardiology. He came to Chattanooga Heart from Duke University Health System in Durham, NC. Dr. Lehman completed a fellowship and residency in Cardiovascular Disease at Duke University. He received his medical degree from Duke University School of Medicine and a Master’s of Public Policy, Concentration in Health Policy from Duke University Sanford School of Public Policy. He graduated summa cum laude from Georgetown University with a Bachelor’s of Science, Biology, where he had the highest GPA for all bachelor of science degrees. He served as a congressional aid on Capitol Hill. Dr. Lehman is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Mitral Valve Regurgitation, Aortic Regurgitation, Necrosis, and Arterial Embolism.

Dr. Carter Hemphill is board certified in cardiovascular diseases, interventional cardiology, endovascular medicine, nuclear cardiology and internal medicine. Dr. Hemphill completed a fellowship in interventional cardiology at Texas A & M College of Medicine/Scott & White Hospital. He completed his residency in internal medicine and cardiovascular disease fellowship at the University of Texas Health Science Center.Dr. Hemphill received his medical degree from the University of South Carolina School of Medicine and a bachelor’s degree from Columbia University in New York. He previously served as a clinical assistant professor at the University of Tennessee Health Science Center College of Medicine at Chattanooga. Dr. Hemphill is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Angina, Atherosclerosis, Coronary Heart Disease, Angioplasty, and Heart Bypass Surgery.

Dr. Henry Cheng is board-certified in imaging and general cardiology. He earned his medical degree from the University of California at Los Angeles. Dr. Cheng completed an internal medicine residency at Johns Hopkins Hospital in Baltimore, MD, and a cardiovascular medicine fellowship at the Hospital of the University of Pennsylvania in Philadelphia, PA. In addition to general cardiology care, Dr. Cheng specializes in cardio-oncology, echocardiography, and nuclear cardiology. He sees patients at the Chattanooga Citico office and at our Hixson office. Dr. Cheng is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Mitral Valve Regurgitation, Necrosis, Dilated Cardiomyopathy (DCM), and Cardiomyopathy.

Dr. Aaron Soufer comes to The Chattanooga Heart Institute from Yale New Haven Hospital where he completed a fellowship in Cardiovascular Medicine and an advanced fellowship in Multimodality Cardiac Imaging. He also completed his internship and residency at Yale New Haven Hospital. Dr. Soufer is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Mitral Valve Regurgitation, Cardiomyopathy, Coronary Heart Disease, and Aortic Regurgitation.

Dr. Aditya Mandawat is board certified in Internal Medicine, in Cardiovascular Diseases and in Interventional Cardiology. He also holds specialized board certifications in Echocardiography and Cardiac MRI. He completed Fellowships in Cardiology, Cardiovascular Diseases Research, Advanced Cardiovascular Imaging and Interventional Cardiology at Duke University Hospital in Durham, NC. Dr. Mandawat completed his internship and residency at Brigham and Women’s Hospital in Boston, MA. He earned a degree in medicine at Case Western Reserve University with clinical rotations at the Cleveland Clinic and earned a Bachelor of Science degree in biomedical engineering from Georgia Tech University. Dr. Mandawat is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Heart Attack, Angina, Coronary Heart Disease, Heart Bypass Surgery, and Percutaneous Coronary Intervention (PCI).

Dr. Chad Armstrong comes to The Chattanooga Heart Institute from Vanderbilt University Medical Center where he completed a fellowship in Cardiovascular Medicine and where he also completed an Internal Medicine residency. Dr. Armstrong sees patients at our Chattanooga Glenwood office and at our Hixson office. Dr. Armstrong is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Mitral Valve Regurgitation, Necrosis, Aortic Regurgitation, and Aortic Valve Stenosis.

Dr. Brian Mitchell is board certified in cardiovascular medicine, internal medicine and nuclear cardiology. He has been with Chattanooga Heart since 2004 and is the recipient of numerous awards and honors.Dr. Mitchell completed his residency in internal medicine and fellowship in cardiology at the University of Arizona, Tucson. He graduated from the University of Tennessee College of Medicine in Memphis. He graduated magna cum laude from the University of Tennessee with bachelor degrees in both biology and anthropology.Dr. Mitchell is board certified in Cardiology, Internal Medicine and Nuclear Cardiology. He is a Fellow in the American College of Cardiology.Dr. Mitchell completed his residency in internal medicine and fellowship in cardiology at the University of Arizona, Tucson.Dr. Mitchell is board certified in Cardiology, Internal Medicine and Nuclear Cardiology. He is a Fellow in the American College of Cardiology. Dr. Mitchell is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Heart Attack, Brugada Syndrome, Short QT Syndrome, Postural Orthostatic Tachycardia Syndrome (POTS), and Pacemaker Implantation.

A native of Belle Harbor, New York, Dr. Joseph K. Powers received his medical degree from New York Health Science Center at Brooklyn. He completed a fellowship in cardiovascular diseases at Presbyterian Medical Center in Philadelphia. He served his residency and internship in internal medicine at Beth Israel Medical Center in New York City.Dr. Powers is a member of the American College of Physicians, the American Society of Nuclear Cardiology and the American College of Cardiology. He serves as a member of the Tennessee Medical Society and belongs to the Bradley County Medical Society. Dr. Powers has jointly published numerous abstracts and papers related to cardiac imaging and remains interested in this field. Dr. Powers is rated as a Distinguished provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Heart Attack, and Angina.

Mark Crago is a primary care provider, practicing in Family Medicine in Ooltewah, Tennessee. Dr. Crago is rated as an Experienced provider by MediFind in the treatment of Coronary Heart Disease. His top areas of expertise are Type 2 Diabetes (T2D), Osteomyelitis in Children, Familial Hypertension, and Glucocorticoid-Remediable Aldosteronism.