A native of Baltimore, Maryland, Smith graduated with a B.A. degree from Dartmouth College in 1940. He then worked at Camp William James, a center for youth leadership training opened in 1940 by Eugen Rosenstock-Huessy, a Dartmouth College professor, as part of the Civilian Conservation Corps. Smith was awarded a Purple Heart for his service as a company commander of the 10th Mountain Division of the United States Army during World War II.
After receiving his doctorate, Smith began work as a research associate at the Institute of Early American History and Culture in Williamsburg, Virginia in 1951. He then taught history at the College of William and Mary in Williamsburg. From 1953 to 1964, he was a professor of history at UCLA. In 1964, he became the founding provost of Cowell College, the first college of the University of California, Santa Cruz (UCSC). He taught history at UCSC until 1973 when he retired as a Professor Emeritus of History.
Both before and after retirement, Smith was intellectually active as a scholar, author, and columnist. He wrote more than 20 books, including a biography of John Adams that won the 1963 Bancroft Prize, and an eight-volume A People's History of the United States.
Smith also worked as a community activist for the homeless in Santa Cruz. He co-founded (with longtime colleague Paul Lee) the William James Association in Santa Cruz, which helped establish a homeless shelter as well as the Homeless Garden Project. He also co-founded the Penny University, which organizes free weekly lectures and discussions for the community, and the Prison Arts Project.
Page Smith's archives are housed at the University of California Los Angeles (UCLA) Special Collections but have yet to be cataloged.
In 1942, Smith married Eloise Pickard (1921–1995). They were married for fifty-three years. Eloise Pickard died of kidney cancer two days before Smith's own death from leukemia at their home in Santa Cruz. They had four children.
- James Wilson (1956)
- John Adams [2 v.] (New York: Doubleday, 1962)
- The Historian and History (1964)
- A City Upon a Hill (1966)
- Daughters of the Promised Land (1970)
- The Chicken Book: Being an Inquiry into the Rise and Fall, Use and Abuse, Triumph and Tragedy of Gallus Domesticus (Boston: Little, Brown, 1975) [with Charles Daniel]
- A People's History of the United States [8 v.] (McGraw-Hill, 1976–1987)
- The Constitution: A Documentary and Narrative History (1978)
- Dissenting Opinions (1984)
- Killing the Spirit: Higher Education in America (New York: Viking, 1990)
- Rediscovering Christianity: A History of Modern Democracy and the Christian Ethic (New York: St. Martin's, 1994)
- Democracy on Trial: The Japanese-American Evacuation and Relocation in World War II (New York: Simon & Schuster, 1995)
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