Dr. Greenfield is a Northwestern Memorial Hospital cardiologist committed to providing the highest quality attention to adults concerned about the care of their heart. He is Board Certified in both Cardiology and Internal Medicine and has special Board certifiaction in Echocardiography-Cardiac Ultrasound.Dr. Greenfield attended medical school at McGill University in Montreal, Canada and conducted his internship, residency, and fellowship at Royal Victoria Hospital in Canada. He completed a research fellowship at Northwestern University's McGaw Medical Center.An instructor of Clinical Cardiology at Northwestern University's Feinberg School of Medicine, Dr. Greenfield focuses on both preventive and treatment aspects of cardiac disease and general internal medicine. He believes strongly in the power of communication, between the patient and physician and between all the physicians involved in the patient's care.