Callers and Interview with  Harry Binswanger (/ˈbɪnzwæŋər/; born 1944) is an American philosopher. He is an Objectivist and a board member of the Ayn Rand Institute. He was an associate of Ayn Rand, working with her on The Ayn Rand Lexicon and helping her edit the second edition of Rand's Introduction to Objectivist Epistemology. He is the author of How We Know: Epistemology on an Objectivist Foundation