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Isadore Rosenfeld (born Ezra Rosenfeld in 1927) is a Canadian-American cardiologist and best-selling author.

Early life
Isadore Rosenfeld was born in Montreal, Quebec in 1927 to low-income parents who had escaped Russia during the Bolshevik Revolution. His parents had named him Ezra Rosenfeld at birth, but decided a few months later to call him Issie in order to spare him potential antisemitism later in life. Rosenfeld discovered that Issie was short for Isadore in fifth grade, and that became his preferred first name.

Rosenfeld graduated from Baron Byng High School in Montreal in 1943 and enrolled in McGill University. In 1947, he recieved his bachelor's degree and decided to continue his education at McGill's Faculty of Medicine. During his third year of medical school, Rosenfeld briefly considered running for a seat in the Canadian House of Commons, but was persuaded to finish his education and internship first. His brief flirtation with politics helped him achieve a position as a senior speechwriter for Canadian Minister of Defence Brooke Claxton.. In June of 1951 he received his M.D. degree from McGill and was accepted as an intern at Royal Victoria Hospital in Montreal.

Career as cardiologist
Rosenfeld finished his postgraduate training in 1956 and started his private practice as a cardiologist in Montreal. After two years, he move to New York in part because of the political uncertainty caused by the popularity of the Quebec sovereignty movement. His practice started out small in New York and he spent much time doing clinical research which was published in academic journals around the world. He eventually received full staff privileges at New York Hospital and slowly built his private practice.

His big break came when he was called by Antenor Patiño, the Bolivian "King of Tin". Patiño's wife had suffered what appeared to be a heart attack and he wanted Rosenfeld to provide a second opinion. After examining her, Rosenfeld realized she had not suffered a heart attack, but rather her symptoms were due to radiculopathy, a much different diagnosis. Patiño was impressed with Rosenfeld's skill as a doctor and recommended him to his friend Aristotle Onassis. Onassis had just married Jackie Kennedy and Rosenfeld's association with the couple made Rosenfeld one of the better known physicians in the United States.

Books
Rosenfeld wrote his first book for the layman, The Complete Medical Exam in 1978. He would eventually write twelve more books, nine of which would become best sellers.

Notable patients

 * Stavros Niarchos