Weill Cornell Medicine’s Dr. Isadore Rosenfeld, a nationally known cardiologist, author and a founding member of the institution’s Board of Overseers, died Jan. 30 in Greenwich, Conn. He was 91.

Rosenfeld was “one of Weill Cornell Medicine’s most beloved faculty leaders,” said Dr. Augustine M.K. Choi, the Stephen and Suzanne Weiss Dean of Weill Cornell Medicine and Cornell provost for medical affairs. “Issie was an astute and compassionate clinician devoted to his patients, a dedicated educator and a generous supporter of medical research.”

Rosenfeld was born Sept. 7, 1926, in Montreal. He earned his B.S. in 1947, and his M.D.C.M. in 1951. After his initial appointment as an instructor in medicine, he joined Weill Cornell Medicine's faculty in 1958.

He was named the Ida and Theo Rossi Distinguished Professor of Clinical Medicine in 1993.

Rosenfeld attended the first Weill Cornell Medicine Board of Overseers meeting on March 21, 1980, and helped to steer the institution for 34 years. He became a life overseer in 2014 and received Weill Cornell Medicine and NewYork-Presbyterian’s highest honor, the Maurice R. Greenberg Distinguished Service Award, in 2006.

Rosenfeld served as the health editor of Parade magazine and was host of “Sunday Housecall with Dr. Rosenfeld” on Fox News. He wrote 14 best-selling books including “Symptoms” (1989), “Live Now, Age Later: Proven Ways to Slow Down the Clock” (1999), “The Best Treatment” (1991) and “Dr. Rosenfeld’s Guide to Alternative Medicine” (1997). He authored more than 50 peer-reviewed articles and co-authored a textbook on cardiology.

He is survived by his wife, Camilla; three sons and a daughter.