(written from a Production point of view)
He first appeared in the VOY third season episode "Warlord" for which he filmed his scenes between Wednesday 4 September 1996 and Monday 9 September 1996 on Paramount Stage 16. His costume from this episode was later sold off on the It's A Wrap! sale and auction on eBay.  In 2002 he portrayed Larr in the ENT first season episode "Dear Doctor".
Wiedergott is best known for his work on the animated television series The Simpsons (1998-2010, co-starring Frank Welker and Kelsey Grammer) and has lent his voice to The Simpsons: Hit and Run video game (2003) and The Simpsons Movie (2007, also co-starring Kelsey Grammer).
Among his acting resume are films such as The Education of Allison Tate (1986, with Leslie Hope), Monday Morning (1990, with Annie O'Donnell), Attack of the 5 Ft. 2 Women (1994, with Lilyan Chauvin, Barry Kivel, and Amy O'Neill), The Confidence Man (1996, with Barbara Alyn Woods and John Putch), Pirates of Silicon Valley (1999, with J.G. Hertzler, Wayne Pere, Jeffrey Nordling, Marc Worden, Kitty Swink, Paul Popowich, Nikita Ager, Alexander Enberg, and stunts by Rick Avery and Brian Avery), and Two Days (2003, with Adam Scott).
He has also appeared in television series such as The Golden Girls (1985 and 1988, with Matthew Faison, Herta Ware, and John Hostetter), 21 Jump Street (1990, with Castulo Guerra and Morgan Woodward), Wings (1993, with Steven Weber), Brimstone (1999, with John Glover, Steven Culp, Lori Petty, and Ray Proscia), ER (2000, with Megan Cole and Lily Mariye), Roswell (2002, with William Sadler and Jack Donner), and The Pitts (2003, with Kellie Waymire and Seth MacFarlane).