Early career (1987–1992) After training under
Johnny Rodz, Theis made his debut on the
independent circuit in 1987 under the ring name "Jonn Reinhart". He later renamed himself "Mondo Kleen". In 1990 he worked for
Tri-State Wrestling Alliance. In September 1992, he wrestled a tryout match with
World Championship Wrestling as "Mando Phil".
World Wrestling Federation (1992–1993, 1994) After
The Bushwhackers helped forward a tape of Theis performing an
interview, the
World Wrestling Federation signed him to a contract. Theis, performing under his Mondo Kleen ring name, debuted in WWF at a
live event on October 2, 1992, wrestling
Jeff Jarrett in a losing effort. Ten days later, on the October 12 episode of
Superstars of Wrestling, Theis made his televised debut under the repackaged ring name and gimmick of "Damien Demento", a
villainous character who hailed from "The Outer Reaches of Your Mind" and showed mentally disturbed behavior such as talking to himself. He then proceeded to defeat Steve May in his televised debut match. He made his only pay-per-view appearance at
Royal Rumble as a participant in the
1993 Royal Rumble match. Demento lasted over twelve minutes before being eliminated by
Carlos Colón. He also appeared at
UK Rampage '93, where he lost to
Bob Backlund. After this, Demento competed almost solely on
house shows before leaving the WWF in October 1993. In July 1994 he came back to work for the WWF in 3 consecutive house shows.
Independent circuit (1993–1995; 2008, 2011, 2014) After a stint on the
East Coast independent circuit, Theis retired from wrestling in 1995. He made another return to the squared circle in September 24, 2011. This time wrestling as "Mondo Kleen", he defeated Steven Person in a
steel cage match at a show that WUW promoted for the
Dumbo Arts Festival. On October 29, 2011, Damien Demento defeated long time WUW Trophy Champion "Izzy" Israel Joffe at the WUW October show at
Gleason's gym to win the WUW Trophy Championship. On December 10, 2011, Israel Joffe defeated Damien Demento at the WUW December show at Gleason's gym. In 2014, Demento made a few appearances for World Wrestling Organization. ==Filmography==