Penn & Teller (Penn Jillette and Teller) are American magicians, entertainers, and scientific skeptics who have performed together since the late 1970s, noted for their ongoing act that combines elements of comedy with magic. The duo has been featured in numerous stage and television shows such as Penn & Teller: Fool Us and they currently perform in Las Vegas at The Rio, the longest running headliners to play at the same hotel in Las Vegas history. Penn Jillette serves as the act's orator and raconteur. Teller generally does not speak while performing, and instead communicates through mime and nonverbals, though his voice can occasionally be heard during their live shows and television appearances. Besides magic, the pair has become associated with the advocacy of scientific skepticism, and libertarianism, particularly through their television show Penn & Teller: Bullshit!