Jeff 'Swampy' Marsh
Acting • Born 1960-12-09
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.
Filmography
22 credits
TV's Funniest Animated Stars: A Paley Center for Media Special
Movie • 2015
Self
Phineas and Ferb The Movie: Across the 2nd Dimension
Movie • 2011
Major Francis Monogram / Monogram-2 (voice)
O.W.C.A. Files
Movie • 2015
Major Monogram / Additional Voices (voice)
Phineas and Ferb: Night of the Living Pharmacists
Movie • 2014
Major Francis Monogram (voice)
Phineas and Ferb Christmas Vacation!
Movie • 2009
Major Monogram (voice)
Phineas and Ferb: The Perry Files - Animal Agents
Movie • 2013
Major Monogram (voice)
Phineas and Ferb: The Daze of Summer
Movie • 2012
Phineas and Ferb: Summer Belongs to You!
Movie • 2010
Major Francis Monogram (voice) / Additional Voices
Phineas and Ferb: Last Day of Summer
Movie • 2015
Major Monogram (voice)
Phineas and Ferb: Mission Marvel
Movie • 2013
Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
Phineas and Ferb: Star Wars
Movie • 2014
Major Hologram / Imperial Officer Jeff / Additional Voices
I Know That Voice
Movie • 2014
Self
Phineas and Ferb the Movie: Candace Against the Universe
Movie • 2020
Major Monogram (voice)
Phineas and Ferb Save Summer
Movie • 2014
Major Francis Monogram / Additional Voices (voice)
Spiked
Movie • 2025
(voice)
Untitled Phineas and Ferb Movie
Movie
Major Francis Monogram (voice)
Aaagh! It's the Mr. Hell Show!
TV • 2001
Josh (voice)
Bounty Hamster
TV • 2003
(voice)
Phineas and Ferb
TV • 2007
Francis Monogram (voice)
Milo Murphy's Law
TV • 2016
Additional Voices (voice)
How Not to Draw
TV • 2022
Major Monogram (voice)
Agent P, Under C
TV • 2026
Major Monogram (voice)