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.
Filmography (22 titles)
8.4ShowAgent P Under C
Major Monogram (voice) · 2026
8.0MovieSpiked
Big Boss Croc / Exterminator (voice) · 2025
8.0ShowHow Not to Draw
Major Monogram (voice) · 2022
7.2MoviePhineas and Ferb the Movie: Candace Against the Universe
Major Monogram (voice) · 2020
7.4ShowMilo Murphy's Law
Additional Voices (voice) · 2016
MovieTV's Funniest Animated Stars: A Paley Center for Media Special
Self · 2015
7.5MovieO.W.C.A. Files
Major Monogram / Additional Voices (voice) · 2015
8.0MoviePhineas and Ferb: Last Day of Summer
Major Monogram (voice) · 2015
7.9MoviePhineas and Ferb: Night of the Living Pharmacists
Major Francis Monogram (voice) · 2014
7.2MoviePhineas and Ferb: Star Wars
Major Hologram / Imperial Officer Jeff / Additional Voices · 2014
8.0MoviePhineas and Ferb Save Summer
Major Francis Monogram / Additional Voices (voice) · 2014
7.1MovieI Know That Voice
Self · 2014
6.6MoviePhineas and Ferb: Mission Marvel
Francis Major Monogram / Gordon Gutsofanemu / Additional Voices · 2013
8.4MoviePhineas and Ferb: The Perry Files - Animal Agents
Major Monogram (voice) · 2013
7.0MoviePhineas and Ferb: The Daze of Summer
2012
7.1MoviePhineas and Ferb The Movie: Across the 2nd Dimension
Major Francis Monogram / Monogram-2 (voice) · 2011
7.8MoviePhineas and Ferb: Summer Belongs to You!
Major Francis Monogram / Additional Voices (voice) · 2010
7.3MoviePhineas and Ferb Christmas Vacation!
Major Monogram (voice) · 2009
7.9ShowPhineas and Ferb
Francis Monogram (voice) · 2007
ShowBounty Hamster
(voice) · 2003
6.5ShowAaagh! It's the Mr. Hell Show!
Josh (voice) · 2001
MovieUntitled Phineas and Ferb Movie
Major Francis Monogram (voice) ·