Mr. Rossman’s first book, “The Wedding Within the War” (Doubleday, 1971), was a collection of essays chronicling his experiences in the free speech, antiwar and counterculture movements. Reviewing the collection in The New York Times Book Review, the historian Martin Duberman called it “a dazzling, moving book,” adding: “I find the life Rossman is trying to fashion for himself admirable, and the book he’s written about it exhilarating.”
Mr. Rossman’s other books include “On Learning and Social Change” (Random House, 1972) and “New Age Blues: On the Politics of Consciousness” (Dutton, 1979).
Michael Dale Rossman was born on Dec. 15, 1939, in Denver and reared in Northern California. His father, Harold, was the editor of The Labor Herald, the weekly newspaper of the Congress of Industrial Organizations in California. Mr. Rossman studied at the University of Chicago before transferring to Berkeley, from which he received a bachelor’s degree in mathematics in 1963.
Mr. Rossman was a graduate student in math at Berkeley when the Free Speech Movement burst into being on Oct. 1, 1964. He was among the hundreds of students who massed around a police car that day and the next to stop officers from taking away the civil rights organizer Jack Weinberg. (Mr. Weinberg had been arrested for violating a longstanding university ban on political advocacy on campus.)
A close friend of Mario Savio, the movement’s best-known leader, Mr. Rossman left graduate school in 1966 to devote himself to activism, lecturing on campuses around the country. The Free Speech Movement, which quickly spread to other universities, made political discourse a basic right on college campuses throughout the nation.
Mr. Rossman remained a community activist to the end of his life. For the last three decades, he also taught primary-school science in Berkeley.
In addition to his wife, Mr. Rossman is survived by two sons, Lorca, of Olema, Calif., and Jaime Kaszynski of Olympia, Wash; a brother, Jared, of Redway, Calif.; a sister, Devora Rossman of Mendocino, Calif.; and one grandchild.
As a consequence of his involvement with the Free Speech Movement, Mr. Rossman spent nine weeks in jail in 1967. There, he was assigned to garbage detail, a job far less punitive than his jailers must have imagined.
As Mr. Rossman explained in an essay in “The Wedding Within the War,” he had no sense of smell.
This article has been revised to reflect the following correction:
Correction: May 20, 2008
A picture caption on Monday with an obituary about Michael Rossman, an organizer of the Free Speech Movement at the University of California, Berkeley, misstated the photographer’s surname. The photograph of Mr. Rossman is by Paul Fusco, not Fresco.