Jeff 'Swampy' Marsh
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.
Acting
TV
Phineas and Ferb
as Francis Monogram (voice)
2007
Movie
Phineas and Ferb The Movie: Across the 2nd Dimension
as Major Francis Monogram / Monogram-2 (voice)
2011
Movie
Phineas and Ferb the Movie: Candace Against the Universe
as Major Monogram (voice)
2020
Movie
Phineas and Ferb: Star Wars
as Major Hologram / Imperial Officer Jeff / Additional Voices
2014
Movie
Phineas and Ferb: Mission Marvel
as Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
2013
Movie
I Know That Voice
as Self
2014
TV
Milo Murphy's Law
as Additional Voices (voice)
2016
Movie
Phineas and Ferb: Summer Belongs to You!
as Major Francis Monogram / Additional Voices (voice)
2010
Movie
Phineas and Ferb: Last Day of Summer
as Major Monogram (voice)
2015
Movie
Phineas and Ferb Christmas Vacation!
as Major Monogram (voice)
2009
Movie
Phineas and Ferb: The Perry Files - Animal Agents
as Major Monogram (voice)
2013
Movie
Phineas and Ferb: The Daze of Summer
2012
Movie
O.W.C.A. Files
as Major Monogram / Additional Voices (voice)
2015
Movie
Phineas and Ferb: Night of the Living Pharmacists
as Major Francis Monogram (voice)
2014
TV
Aaagh! It's the Mr. Hell Show!
as Josh (voice)
2001
TV
Agent P Under C
as Major Monogram (voice)
2026
Movie
Spiked
as Big Boss Croc / Exterminator (voice)
2025
TV
How Not to Draw
as Major Monogram (voice)
2022
Movie
Phineas and Ferb Save Summer
as Major Francis Monogram / Additional Voices (voice)
2014
Movie
TV's Funniest Animated Stars: A Paley Center for Media Special
as Self
2015
Movie
Untitled Phineas and Ferb Movie
as Major Francis Monogram (voice)
TV
Bounty Hamster
as (voice)
2003
Crew
TV
Phineas and Ferb
Writer
2007
Movie
Phineas and Ferb The Movie: Across the 2nd Dimension
Sequence Supervisor
2011
Movie
Phineas and Ferb the Movie: Candace Against the Universe
Executive Producer
2020
TV
Rocko's Modern Life
Storyboard Artist
1993
TV
Milo Murphy's Law
Executive Producer
2016
TV
Take Two with Phineas and Ferb
Creator
2010
Movie
Phineas and Ferb: Summer Belongs to You!
Story
2010
Movie
Phineas and Ferb Christmas Vacation!
Producer
2009
TV
Pete the Cat
Writer
2017
Movie
Phineas and Ferb: The Daze of Summer
Writer
2012
Movie
O.W.C.A. Files
Executive Producer
2015
Movie
Looks Can Kill
Associate Producer
1994