Marc is an associate professor of medicine at the Columbia University Medical Center and a Faculty at Rappore, a therapy services and medication management practice based in Manhattan, New York. He is a clinical cardiologist with expertise in the diagnosis and treatment of cardiovascular disease in adults; specializing in cardiac stress testing and echocardiography. His clinical interests also include the accurate diagnosis and treatment of hypertension. He supports organizations that help deliver food to children who go to sleep hungry as well as no-kill animal shelters and families who foster animals. Recently, Marc co-authored Am I Dying?! an expert guide to symptoms and health.