Teller is an American magician, illusionist, writer, actor, painter, and film director. He is best known as half of the comedy magic duo Penn & Teller, along with Penn Jillette. Teller usually does not speak during performances. He is an atheist, debunker, skeptic, and a fellow of the Cato Institute, an organization which is featured prominently in the duo's Showtime series Bullshit!. Teller legally changed his name from "Raymond Joseph Teller" to the mononym "Teller".