Jill Ellen Stein (born May 14, 1950) is an American physician, activist, and politician. She was the Green Party's nominee for President of the United States in the 2012 and 2016 elections and candidate for governor of Massachusetts in 2002 and 2010.
Stein was born in Chicago, Illinois, the daughter of Gladys (née Wool) and Joseph Stein. She was raised in Highland Park, Illinois. Her parents were descended from Russian Jews, and Stein was raised in a Reform Jewish household, attending Chicago's North Shore Congregation Israel. She now considers herself agnostic.
In 1973, Stein graduated magna cum laude from Harvard College, where she studied psychology, sociology, and anthropology. She then attended Harvard Medical School and graduated in 1979. After graduating from Harvard Medical School, Stein practiced internal medicine for 25 years at Beth Israel Deaconess Medical Center, Simmons College Health Center, and Harvard Pilgrim Health Care, which are all located in the Boston area. She also served as an instructor of medicine at Harvard Medical School.