High Quality Content by WIKIPEDIA articles! Jill Stein (born 1950) is an American physician, activist, co-chair of the Green-Rainbow Party and candidate for President of the United States in 2012. Stein was a candidate for Governor of Massachusetts in the 2002 and the 2010 gubernatorial elections. Stein is a resident of Lexington, Massachusetts and a 1979 graduate of Harvard Medical School. She serves on the boards of Greater Boston Physicians for Social Responsibility and MassVoters for Fair Elections, and has been active with the Massachusetts Coalition for Healthy Communities.