Penn & Teller (Penn Jillette and Teller) are American magicians and entertainers who have performed together since the late 1970s, noted for their ongoing act which combines elements of comedy with magic. The duo, having been featured in numerous stage and television shows, currently headline in Las Vegas at The Rio. Penn Jillette serves as the act's orator and raconteur. Teller, however, generally does not speak while performing, and instead communicates through mime and nonverbals, although his voice can occasionally be heard during their live shows and television appearances. Besides magic, the pair have become associated with the advocacy of atheism, scientific skepticism, and libertarianism, particularly through their television show Penn & Teller: Bullshit!