In 2009, Dennis and his producer Allen Estrin started a website called PragerU, which creates five-minute videos on various topics from a conservative perspective. BuzzFeed News described it as “one of the biggest, most influential and yet least understood forces in online media.”
Videos cover topics such as racism, income inequality, sexism, gun ownership, Islam, immigration, Israel, police brutality” and speech on college campuses. BuzzFeed News wrote that “the biggest reason PragerU has escaped national attention is that it mostly doesn’t engage with the political news cycle.