Biography
Jeff "Swampy" Marsh (born December 9, 1960) is an American animator, writer, director, producer, and voice actor associated with several animated television series, most notably as an executive producer and the voice of Major Monogram for Disney's animated series Phineas and Ferb and Milo Murphy's Law, both of which he co-created with Dan Povenmire. Marsh was born in Santa Monica, California, where he grew up with a heavily blended family dynamic. Marsh has been and continues to be a driving force behind several animation projects, working for over six seasons on the animated television series The Simpsons. Marsh continued to work on other animated television series, including King of the Hill and Rocko's Modern Life, before moving to England in 1996.
Acted in 15
2020s
- 2026
- 2025
- 2022
- 2020
2010s
- 2016
- 2014
- 2013
Phineas and Ferb: The Perry Files - Animal Agents
Major Monogram (voice)
- 2012
Phineas and Ferb: The Daze of Summer
Movie
- 2011
- 2010
Phineas and Ferb Summer Belongs to you !
Major Francis Monogramme
2000s
- 2007
- 2003
Bounty Hamster
(voice) · 1 episode
- 2001
Aaagh! It's the Mr. Hell Show!
Josh (voice) · 13 episodes
No release date
Untitled Phineas and Ferb Movie
Major Francis Monogram (voice)
Produced 8
2020s
- 2024
Super Happy Magic Forest
Executive Producer
- 2020
2010s
- 2016
- 2011
- 2010
2000s
- 2007
1990s
- 1994
Looks Can Kill
Associate Producer
No release date
Untitled Phineas and Ferb Movie
Executive Producer
Wrote 7
2010s
- 2017
- 2016
- 2012
Phineas and Ferb: The Daze of Summer
Writer
- 2011
2000s
- 2007
No release date
Untitled Phineas and Ferb Movie
Writer
Created 5
2020s
- 2025
Cartoonified! With Phineas and Ferb
Creator
2010s
- 2017
- 2016
- 2010
2000s
- 2007
Directed 3
2000s
- 2007
- 2004
Shadow of the Elves
Director
1990s
- 1993
Other crew 2
Art department 1
1990s
- 1993
Appearances2
2010s
- 2015
TV's Funniest Animated Stars: A Paley Center for Media Special
Self
- 2014
