Gregory Nevala Calvert (April 16, 1937 – August 12, 2005) was an American political activist, author and academic. In 1965, while teaching at Iowa State University, he joined Students for a Democratic Society (SDS). The following year he was elected SDS National Secretary. During this time, he also served on the National Mobilization Committee to End the War in Vietnam (MOBE). In 1991, he published a memoir of his activist years entitled ''Democracy from the Heart: Spiritual Values, Decentralism, and Democratic Idealism in the Movement of the 1960s''.
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