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 an Advanced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Mitral Valve Regurgitation, Coronary Heart Disease, Atherosclerosis, Heart Bypass Surgery, and Pacemaker Implantation.

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 an Advanced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Atrial Fibrillation, Mitral Valve Regurgitation, Aortic Regurgitation, Coronary Heart Disease, and Heart Bypass Surgery.

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 an Advanced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Mitral Valve Regurgitation, Aortic Regurgitation, Necrosis, and Arterial Embolism.

Brandon Morrical is a Pediatric Cardiologist in Chattanooga, Tennessee. Dr. Morrical is rated as an Advanced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Patent Ductus Arteriosus, Ventricular Septal Defects, Heart Murmurs, Patent Foramen Ovale, and Stent Placement.

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 an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Angina, Aortic Valve Replacement, and Transcatheter Aortic Valve Replacement (TAVR).

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 an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Mitral Valve Regurgitation, Necrosis, Dilated Cardiomyopathy (DCM), and Cardiomyopathy.

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 an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Mitral Valve Regurgitation, Necrosis, Arterial Embolism, Coronary Heart Disease, and Heart Bypass Surgery.

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 an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Angina, Pacemaker Implantation, and Heart Bypass Surgery.

Lisa Carkner is a Cardiologist in Chattanooga, Tennessee. Dr. Carkner is rated as an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). 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 an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Heart Attack, Angina, Coronary Heart Disease, Heart Bypass Surgery, and Angioplasty.

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 an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Angina, Atherosclerosis, Coronary Heart Disease, Angioplasty, and Heart Bypass Surgery.

Jonathan Powell is a Cardiologist in Chattanooga,, Tennessee. Dr. Powell is rated as an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Sengers Syndrome, Mitral Valve Regurgitation, Familial Hypertrophic Cardiomyopathy, Heart Failure, and Pacemaker Implantation.

Kinsman Wright is a Cardiologist in Chattanooga, Tennessee. Dr. Wright is rated as an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Inappropriate Sinus Tachycardia (IST), Familial Ventricular Tachycardia, Long QT Syndrome, and Long QT Syndrome 3.

Patrick Stevens is a Cardiologist in Chattanooga,, Tennessee. Dr. Stevens is rated as an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Mitral Valve Regurgitation, Necrosis, Heart Failure, Pacemaker Implantation, and Transcatheter Aortic Valve Replacement (TAVR).

Dharmendrakumar Patel is a Cardiologist in Chattanooga, Tennessee. Dr. Patel is rated as an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Long QT Syndrome, Long QT Syndrome 5, Timothy Syndrome, Pacemaker Implantation, and Aortic Valve Replacement.

James Raulston is a Pediatric Cardiologist in Chattanooga,, Tennessee. Dr. Raulston is rated as an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Patent Ductus Arteriosus, Heart Murmurs, Ventricular Septal Defects, and DiGeorge Syndrome.

Wesley Davis is a Pediatric Cardiologist in Chattanooga,, Tennessee. Dr. Davis is rated as an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Patent Ductus Arteriosus, Ventricular Septal Defects, X-Linked Cardiac Valvular Dysplasia, and Cardiac Diverticulum.

Matthew Wiisanen is an Interventional Cardiologist and a Cardiologist in Chattanooga, Tennessee. Dr. Wiisanen is rated as an Advanced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Apoplexy, Atrial Fibrillation, Heart Attack, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement. Dr. Wiisanen is currently accepting new patients.

Dr. Ledford completed an internship and residency in Internal Medicine at the National Naval Medical Center at Bethesda. Dr. Ledford completed a fellowship in Cardiovascular Disease at the National Naval Medical Center at Bethesda and a fellowship in Interventional Cardiology at William Beaumont Hospital in Royal Oak, MichiganDr. Ledford was the first cardiologist in this region to perform a percutaneous patent foramen ovale (PFO) closure on an adult patient. This implant is less invasive than open heart surgery thereby posing fewer risks to the patient.Dr. Ledford served for 22 years in the United States Navy receiving numerous awards. He has been published in professional journals and has been the principal investigator on several research projects.Dr. Ledford enjoys outdoor activities especially hiking, camping, boating and travel. He loves to share those, especially with the grandkids. Dr. Ledford is rated as an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Coronary Heart Disease, Heart Attack, Atherosclerosis, Heart Bypass Surgery, and Cardiac Ablation.

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 an Experienced provider by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Angina, Atrial Fibrillation, and Heart Bypass Surgery.