Harry Victor Jaffa

Harry Victor Jaffa (October 7, 1918 – January 10, 2015) was an American political philosopher, historian, columnist, and professor. He was a professor emeritus at Claremont McKenna College, Claremont Graduate University, and was a distinguished fellow of the Claremont Institute. Robert P. Kraynak says his "life work was to develop an American application of Leo Strauss's revival of natural-right philosophy against the relativism and nihilism of our times".

Jaffa wrote on topics ranging from Aristotle and Thomas Aquinas to Abraham Lincoln, Winston Churchill, and natural law. He was published in the Claremont Review of Books, the Review of Politics, National Review, and the New York Times. His most famous work, Crisis of the House Divided: An Interpretation of the Issues in the Lincoln-Douglas Debates, written in 1959, has been described as a touchstone. He wrote the controversial line in 1964 Republican presidential nominee Barry Goldwater's acceptance speech that "extremism in the defense of liberty is no vice".

Jaffa was a formative influence on the American conservative movement, challenging notable conservative thinkers, including Russell Kirk, Richard M. Weaver, and Willmoore Kendall, on Abraham Lincoln and the founding of the United States. He debated Robert Bork on American constitutionalism. He died in 2015.