Dr. E P. Lehman

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 Idiopathic Edema. His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Aortic Valve Stenosis, and Angina.

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 Idiopathic Edema. 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 a Distinguished provider by MediFind in the treatment of Idiopathic Edema. His top areas of expertise are Coronary Heart Disease, Atherosclerosis, Angina, Pacemaker Implantation, and Heart Bypass Surgery.