Dennis Mark Prager (; born August 2, 1948) is an American conservative radio talk show host and writer. He is the host of the nationally syndicated radio talk show The Dennis Prager Show. In 2009, he co-founded PragerU, which primarily creates five-minute videos from an American conservative perspective, among other content. His initial political work starting in 1969 concerned Refuseniks, the Soviet Jews who were unable to emigrate. He gradually began offering more and broader commentary on politics.