Via wikipedia, Penn and Teller are American illusionists and entertainers who have performed together since the late 1970s, and are known for their numerous stage and television shows.
Also, Teller does not speak in front of an audience.
Why did I think one of them died? Haha. But that is awesome. I am sure they were hilarious. Didnt they have a show on HBO about debunking stories or something? I watched one or two.