Peter D. Klein
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Peter David Klein (born 17 September 1940) is a professor of philosophy and chair of the department at Rutgers University, New Jersey. Peter Klein received a BA at Earlham College, and a PhD from Yale University. He is the author of Certainty: A Refutation of Skepticism (1982) and a variety of articles and reviews addressing issues in epistemology.
He is associated with infinitism, the somewhat counter-intuitive view that a belief can be justified by an infinite series of other beliefs, such that it is, so to speak, "turtles all the way down."