Jeff 'Swampy' Marsh

Jeff 'Swampy' Marsh

Acting
Born 1960-12-09 Santa Monica, California, USA 30 credits
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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.
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Filmography
Acting 22 credits
Phineas and Ferb
Phineas and Ferb
2007 · 83% · Creator, Director, Writer
Rocko's Modern Life
Rocko's Modern Life
1993 · 76% · Director, Storyboard Artist, Additional Writing
Milo Murphy's Law
Milo Murphy's Law
2016 · ★ 7.4 · Creator, Story, Executive Producer
How Not to Draw
How Not to Draw
2022 · Major Monogram (voice)
Phineas and Ferb The Movie: Across the 2nd Dimension
Phineas and Ferb The Movie: Across the 2nd Dimension
2011 · 76% · Writer, Executive Producer, Major Francis Monogram / Monogram-2 (voice)
Phineas and Ferb the Movie: Candace Against the Universe
Phineas and Ferb the Movie: Candace Against the Universe
2020 · 75% · Writer, Executive Producer, Major Monogram (voice)
Agent P Under C
Agent P Under C
2026 · Major Monogram (voice)
Phineas and Ferb: Mission Marvel
Phineas and Ferb: Mission Marvel
2013 · 66% · Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
Phineas and Ferb: Star Wars
Phineas and Ferb: Star Wars
2014 · 74% · Major Hologram / Imperial Officer Jeff / Additional Voices
Spiked
Spiked
2025 · Big Boss Croc / Exterminator (voice)
Aaagh! It's the Mr. Hell Show!
Aaagh! It's the Mr. Hell Show!
2001 · Josh (voice)
Bounty Hamster
Bounty Hamster
2003 · (voice)
O.W.C.A. Files
O.W.C.A. Files
2015 · Executive Producer, Major Monogram / Additional Voices (voice)
I Know That Voice
I Know That Voice
2014 · 75% · Self
Phineas and Ferb Christmas Vacation!
Phineas and Ferb Christmas Vacation!
2009 · Producer, Major Monogram (voice)
Phineas and Ferb: Night of the Living Pharmacists
Phineas and Ferb: Night of the Living Pharmacists
2014 · Major Francis Monogram (voice)
TV's Funniest Animated Stars: A Paley Center for Media Special
TV's Funniest Animated Stars: A Paley Center for Media Special
2015 · Self
Phineas and Ferb: Last Day of Summer
Phineas and Ferb: Last Day of Summer
2015 · Major Monogram (voice)
Phineas and Ferb: Summer Belongs to You!
Phineas and Ferb: Summer Belongs to You!
2010 · Story, Major Francis Monogram / Additional Voices (voice), Additional Writing
Phineas and Ferb Save Summer
Phineas and Ferb Save Summer
2014 · Major Francis Monogram / Additional Voices (voice)
Untitled Phineas and Ferb Movie
Untitled Phineas and Ferb Movie
· Writer, Executive Producer, Major Francis Monogram (voice)
Phineas and Ferb: The Perry Files - Animal Agents
Phineas and Ferb: The Perry Files - Animal Agents
2013 · Major Monogram (voice)
Producing 11 credits
Phineas and Ferb
Phineas and Ferb
2007 · 83% · Creator, Director, Writer
Milo Murphy's Law
Milo Murphy's Law
2016 · ★ 7.4 · Creator, Story, Executive Producer
Take Two with Phineas and Ferb
Take Two with Phineas and Ferb
2010 · Creator, Executive Producer
Phineas and Ferb The Movie: Across the 2nd Dimension
Phineas and Ferb The Movie: Across the 2nd Dimension
2011 · 76% · Writer, Executive Producer, Major Francis Monogram / Monogram-2 (voice)
Phineas and Ferb the Movie: Candace Against the Universe
Phineas and Ferb the Movie: Candace Against the Universe
2020 · 75% · Writer, Executive Producer, Major Monogram (voice)
Super Happy Magic Forest
Super Happy Magic Forest
2024 · Executive Producer
Hey A.J.!
Hey A.J.!
2026 · 36% · Executive Producer
O.W.C.A. Files
O.W.C.A. Files
2015 · Executive Producer, Major Monogram / Additional Voices (voice)
Phineas and Ferb Christmas Vacation!
Phineas and Ferb Christmas Vacation!
2009 · Producer, Major Monogram (voice)
Untitled Phineas and Ferb Movie
Untitled Phineas and Ferb Movie
· Writer, Executive Producer, Major Francis Monogram (voice)
Looks Can Kill
Looks Can Kill
1994 · Associate Producer
Writing 10 credits
Phineas and Ferb
Phineas and Ferb
2007 · 83% · Creator, Director, Writer
Milo Murphy's Law
Milo Murphy's Law
2016 · ★ 7.4 · Creator, Story, Executive Producer
Take Two with Phineas and Ferb
Take Two with Phineas and Ferb
2010 · Creator, Executive Producer
Phineas and Ferb The Movie: Across the 2nd Dimension
Phineas and Ferb The Movie: Across the 2nd Dimension
2011 · 76% · Writer, Executive Producer, Major Francis Monogram / Monogram-2 (voice)
Phineas and Ferb the Movie: Candace Against the Universe
Phineas and Ferb the Movie: Candace Against the Universe
2020 · 75% · Writer, Executive Producer, Major Monogram (voice)
Pete the Cat
Pete the Cat
2017 · 72% · Creator, Writer
Cartoonified! With Phineas and Ferb
Cartoonified! With Phineas and Ferb
2025 · Creator
Phineas and Ferb: Summer Belongs to You!
Phineas and Ferb: Summer Belongs to You!
2010 · Story, Major Francis Monogram / Additional Voices (voice), Additional Writing
Phineas and Ferb: The Daze of Summer
Phineas and Ferb: The Daze of Summer
2012 · Writer
Untitled Phineas and Ferb Movie
Untitled Phineas and Ferb Movie
· Writer, Executive Producer, Major Francis Monogram (voice)
Directing 3 credits
Phineas and Ferb
Phineas and Ferb
2007 · 83% · Creator, Director, Writer
Rocko's Modern Life
Rocko's Modern Life
1993 · 76% · Director, Storyboard Artist, Additional Writing
Shadow of the Elves
Shadow of the Elves
2004 · Director
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