Massachusetts General Hospital's directory describes Dr. Nancy Gracin, MD as a general cardiologist at the Corrigan Minehan Heart Center with over 25 years of clinical experience, board-certified in Cardiology and echocardiography, and Assistant Professor of Medicine. She is a well-known clinician in the field of dysautonomia and POTS — directly relevant to the Long COVID community where these conditions are central. Her clinical interests also include valvular heart disease, coronary artery disease, arrhythmias, difficult hypertension, and heart failure. She practices at three locations: Mass General Brigham Healthcare Center in Waltham (52 Second Ave; 617-726-2000), Mass General Heart Center in Boston (55 Fruit St; 866-644-8910), and Mass General Brigham Healthcare Center in Danvers (102-104 Endicott St; 978-882-6191). Languages: English, French, Serbo-Croatian. MD from Georgetown; residency and fellowship at Rush University Medical Center.