Phil Theis worked as a professional wrestler in the mid-1990s. He began on the independent circuit as "Mondo Kleen," and in 1992 made the big jump to the World Wrestling Federation where he was known as "Damien Demento." Demento was a short-lived character with the WWF, but he did have the honor of being half of the very main event on the very first episode of WWF's "Monday Night Raw" television show. He lost the match to the Undertaker.

Theis has since retired from professional wrestling and hosts a cable access children's show in Long Island, New York.