Jeff 'Swampy' Marsh
Acting
16
Acting Credits
3
Directed
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 for...
Known For
Phineas and Ferb
Francis Monogram (voice)
Phineas and Ferb
Rocko's Modern Life
Milo Murphy's Law
Additional Voices (voice)
Phineas and Ferb the Movie: Across the 2nd Dimension
Major Francis Monogram / Monogram-2 (voice)
Phineas and Ferb the Movie: Candace Against the Universe
Major Monogram (voice)
Phineas and Ferb: Mission Marvel
Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
How Not to Draw
Major Monogram (voice)
Filmography
Agent P Under C
2026
as Major Monogram (voice)
Spiked
2025
as Big Boss Croc / Exterminator (voice)
How Not to Draw
2022
as Major Monogram (voice)
Phineas and Ferb the Movie: Candace Against the Universe
2020
as Major Monogram (voice)
Milo Murphy's Law
2016
as Additional Voices (voice)
TV's Funniest Animated Stars: A Paley Center for Media Special
2015
as Self
O.W.C.A. Files
2015
as Major Monogram / Additional Voices (voice)
Phineas and Ferb: Star Wars
2014
as Major Hologram / Imperial Officer Jeff / Additional Voices
I Know That Voice
2014
as Self
Phineas and Ferb: The Perry Files - Animal Agents
2013
as Major Monogram (voice)
Phineas and Ferb: Mission Marvel
2013
as Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
Phineas and Ferb: The Daze of Summer
2012
Phineas and Ferb the Movie: Across the 2nd Dimension
2011
as Major Francis Monogram / Monogram-2 (voice)
Phineas and Ferb
2007
as Francis Monogram (voice)
Bounty Hamster
2003
as (voice)
Aaagh! It's the Mr. Hell Show!
2001
as Josh (voice)