Berns was raised in Chicago, where, as late as 1926, he was impressed by "Union soldiers in the parade feebly carrying the standard." He attended Reed College and the General Course at the London School of Economics and Political Science—"where learned little, other than to love London"—and received his bachelor's degree from the University of Iowa. World War II intervened, and "there was no question but that would serve in WW II." He served in the U.S. Navy from 1941 to 1945. After the war, he lived and worked as a waiter in Taos, New Mexico, where he befriended Frieda Lawrence. She persuaded him that he did not have a future as a writer, so Berns returned to academia. He studied for his Ph.D. under Leo Strauss at the University of Chicago, where he also became lifelong friends with Herbert Storing. He taught political philosophy at Louisiana State University and Yale University. In 1959, he joined the government department at Cornell University.
The upheaval at Cornell
Berns taught at Cornell from 1959 to 1969 and chaired the Department of Government from 1963 to 1967. He was a popular professor, "applauded after every lecture in their large courses, not merely after the last lecture of the semester, which was the normal student acknowledgment of a course well taught." Berns became friends with his faculty colleague Allan Bloom during these years. He was less than impressed by the attitudes of the faculty class at the time:
I recall a faculty party at Cornell, the day after the annual Fourth of July celebration at the university football stadium with fireworks. The wife of an economics professor, when asked if she had enjoyed the fireworks, replied, "Yes, but I could have done without all the flag-waving." This reminded me of that familiar old song—familiar in some circles, at least—"If you don't like my peaches, why do you shake my tree?"
Berns was an active participant in the debates leading up to the takeover of the Cornell student union by black separatist activists in 1969. Berns and Bloom were among a small cohort of professors who argued for the primacy of the liberal arts and for "academic freedom" to disagree with the changes and "new orthodoxy" spearheaded by university president James A. Perkins, such as the erosion of the core curriculum and the concessions to demands for a black-only college. Berns was targeted by protesters for his role in the campus debate; in his radio broadcast after taking over the student union on April 19, 1969, Thomas W. Jones included Berns in a list of those opposing the protesters: "Walter Berns is a racist." Once the student union takeover was settled in favor of the protesters, and after receiving personal threats, Berns resigned from Cornell and took up a position at the University of Toronto.
Berns married Irene Lyons Berns in 1951; they lived in Chevy Chase, Maryland. In 2005, Berns received the National Humanities Medal from President George W. Bush. He was an Episcopalian. Berns died of respiratory failure in Bethesda, Maryland, on January 10, 2015, aged 95, on the same day as his fellow Straussian rival Harry V. Jaffa.