Howard Zinn, the author of "A People's History of the United States" and several other books, has died. The Boston Herald reports he suffered a heart attack today in Santa Monica. Zinn was 87.

Zinn, a longtime professor at Boston University, was known for his left-wing politics. Born in New York, Zinn served in the Army Air Forces during World War II, where he became a second lieutenant. He attended New York University on the GI bill after the war, enrolling as a 27-year-old freshman; he did his postgraduate work at Columbia. As a young professor, he became a vocal opponent of the Vietnam War.

He published books on the Vietnam War, as well as other books on history and American society. But it was his 1980 book "A People's History of the United States" and its follow-up, "Voices of a People's History of the United States," that made him required reading. Literally -- "A People's History of the United States" presented American history from alternative perspectives, including native peoples, slaves, disenfranchised workers, farmers and women.

Zinn's works remain in print; a new edition of "Voices of a People's History of the United States" came out in November, and a revised edition of "A People's History of the United States" is set to be published in July.

Howard Zinn, the Boston University historian and political activist who was an early opponent of US involvement in Vietnam and a leading faculty critic of BU president John Silber, died of a heart attack today in Santa Monica, Calif, where he was traveling, his family said. He was 87.

"His writings have changed the consciousness of a generation, and helped open new paths to understanding and its crucial meaning for our lives," Noam Chomsky, the left-wing activist and MIT professor, once wrote of Dr. Zinn. "When action has been called for, one could always be confident that he would be on the front lines, an example and trustworthy guide."

For Dr. Zinn, activism was a natural extension of the revisionist brand of history he taught. Dr. Zinn's best-known book, "A People's History of the United States" (1980), had for its heroes not the Founding Fathers -- many of them slaveholders and deeply attached to the status quo, as Dr. Zinn was quick to point out -- but rather the farmers of Shays' Rebellion and the union organizers of the 1930s.

As he wrote in his autobiography, "You Can't Be Neutral on a Moving Train" (1994), "From the start, my teaching was infused with my own history. I would try to be fair to other points of view, but I wanted more than 'objectivity'; I wanted students to leave my classes not just better informed, but more prepared to relinquish the safety of silence, more prepared to speak up, to act against injustice wherever they saw it. This, of course, was a recipe for trouble."

Certainly, it was a recipe for rancor between Dr. Zinn and Silber. Dr. Zinn twice helped lead faculty votes to oust the BU president, who in turn once accused Dr. Zinn of arson (a charge he quickly retracted) and cited him as a prime example of teachers "who poison the well of academe."

Dr. Zinn was a cochairman of the strike committee when BU professors walked out in 1979. After the strike was settled, he and four colleagues were charged with violating their contract when they refused to cross a picket line of striking secretaries. The charges against "the BU Five" were soon dropped, however.

Dr. Zinn was born in New York City on Aug. 24, 1922, the son of Jewish immigrants, Edward Zinn, a waiter, and Jennie (Rabinowitz) Zinn, a housewife. He attended New York public schools and worked in the Brooklyn Navy Yard before joining the Army Air Force during World War II. Serving as a bombardier in the Eighth Air Force, he won the Air Medal and attained the rank of second lieutenant.

After the war, Dr. Zinn worked at a series of menial jobs until entering New York University as a 27-year-old freshman on the GI Bill. Professor Zinn, who had married Roslyn Shechter in 1944, worked nights in a warehouse loading trucks to support his studies. He received his bachelor's degree from NYU, followed by master's and doctoral degrees in history from Columbia University.

Dr. Zinn was an instructor at Upsala College and lecturer at Brooklyn College before joining the faculty of Spelman College in Atlanta, in 1956. He served at the historically black women's institution as chairman of the history department. Among his students were the novelist Alice Walker, who called him "the best teacher I ever had," and Marian Wright Edelman, future head of the Children's Defense Fund.

During this time, Dr. Zinn became active in the civil rights movement. He served on the executive committee of the Student Nonviolent Coordinating Committee, the most aggressive civil rights organization of the time, and participated in numerous demonstrations.

Dr. Zinn became an associate professor of political science at BU in 1964 and was named full professor in 1966.

The focus of his activism now became the Vietnam War. Dr. Zinn spoke at countless rallies and teach-ins and drew national attention when he and another leading antiwar activist, Rev. Daniel Berrigan, went to Hanoi in 1968 to receive three prisoners released by the North Vietnamese.

Dr. Zinn's involvement in the antiwar movement led to his publishing two books: "Vietnam: The Logic of Withdrawal" (1967) and "Disobedience and Democracy" (1968). He had previously published "LaGuardia in Congress" (1959), which had won the American Historical Association's Albert J. Beveridge Prize; "SNCC: The New Abolitionists" (1964); "The Southern Mystique" (1964); and "New Deal Thought" (1966).
Dr. Zinn was also the author of "The Politics of History" (1970); "Postwar America" (1973); "Justice in Everyday Life" (1974); and "Declarations of Independence" (1990).

In 1988, Dr. Zinn took early retirement so as to concentrate on speaking and writing. The latter activity included writing for the stage. Dr. Zinn had two plays produced: "Emma," about the anarchist leader Emma Goldman, and "Daughter of Venus."

Dr. Zinn, or his writing, made a cameo appearance in the 1997 film "Good Will Hunting." The title characters, played by Matt Damon, lauds "A People's History" and urges Robin Williams's character to read it. Damon, who co-wrote the script, was a neighbor of the Zinns growing up.

Damon was later involved in a television version of the book, "The People Speak," which ran on the History Channel in 2009. Damon was the narrator of a 2004 biographical documentary, "Howard Zinn: You Can't Be Neutral on a Moving Train."

On his last day at BU, Dr. Zinn ended class 30 minutes early so he could join a picket line and urged the 500 students attending his lecture to come along. A hundred did so.

Dr. Zinn's wife died in 2008. He leaves a daughter, Myla Kabat-Zinn of Lexington; a son, Jeff of Wellfleet; three granddaugthers; and two grandsons.