Leonard S. Peikoff (/ˈpiːkɑːf/; born October 15, 1933) is a Canadian-American philosopher. A former professor of philosophy, he was designated by the philosopher Ayn Rand as heir to her estate. He is an author, a leading advocate of Objectivism, and the founder of the Ayn Rand Institute (ARI). For several years, he hosted a nationally syndicated radio talk show.