Charleston, SC

Gregory Feldman, MD, is a triple-board-certified physician in Internal Medicine, Critical Care, and Pulmonology, with more than 30 years of experience working with pulmonary patients in clinical trials. Since 2007, he has completed more than 200 studies, with particular depth in respiratory, vaccine, and cardiometabolic research. He leads MBR Charleston as Principal Investigator and is a standout respiratory and pulmonology investigator.

Keith Horvath, MD, is an investigator with Monroe Biomedical Research in North Charleston, South Carolina. A board-certified surgeon with specialty training in cardiothoracic surgery, Dr. Horvath has decades of experience in cardiac and thoracic care, academic medicine, and clinical research. He earned his medical degree from the University of Chicago Pritzker School of Medicine and completed surgical training at Brigham and Women’s Hospital, with additional research training at Massachusetts General Hospital. His research background spans cardiovascular surgery, valve disease, CABG, atrial fibrillation, transfusion practices, renal protection, neuroprotection, and cardiac surgery outcomes. At MBR, he supports clinical research with a strong foundation in surgical expertise, patient care, and evidence-based medicine.