Jeff 'Swampy' Marsh
Known for ActingBorn 1960-12-09Santa Monica, California, USA
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.
Known for
Phineas and Ferb The Movie: Across the 2nd Dimension
2011 · as Major Francis Monogram / Monogram-2 (voice)
Phineas and Ferb the Movie: Candace Against the Universe
2020 · as Major Monogram (voice)
Phineas and Ferb: Mission Marvel
2013 · as Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
I Know That Voice
2014 · as Self
Phineas and Ferb: The Daze of Summer
2012
Spiked
2025 · as Big Boss Croc / Exterminator (voice)
Phineas and Ferb: Star Wars
2014 · as Major Hologram / Imperial Officer Jeff / Additional Voices
O.W.C.A. Files
2015 · as Major Monogram / Additional Voices (voice)
Untitled Phineas and Ferb Movie
as Major Francis Monogram (voice)
Phineas and Ferb: Summer Belongs to You!
2010 · as Major Francis Monogram / Additional Voices (voice)
TV's Funniest Animated Stars: A Paley Center for Media Special
2015 · as Self
Phineas and Ferb: Last Day of Summer
2015 · as Major Monogram (voice)
Phineas and Ferb: The Perry Files - Animal Agents
2013 · as Major Monogram (voice)
Phineas and Ferb Christmas Vacation!
2009 · as Major Monogram (voice)
Phineas and Ferb Save Summer
2014 · as Major Francis Monogram / Additional Voices (voice)
Phineas and Ferb: Night of the Living Pharmacists
2014 · as Major Francis Monogram (voice)