- Known For
- Acting
- Born
- December 9, 1960
- Place of Birth
- Santa Monica, California, USA
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
tvAgent P Under C
2026 · Major Monogram (voice)
tvHey A.J.!
2026 · Executive Producer
tvCartoonified! With Phineas and Ferb
2025 · Creator
movieSpiked
2025 · Big Boss Croc / Exterminator (voice)
tvSuper Happy Magic Forest
2024 · Executive Producer
tvHow Not to Draw
2022 · Major Monogram (voice)
moviePhineas and Ferb the Movie: Candace Against the Universe
2020 · Major Monogram (voice), Executive Producer, Writer
tvPete the Cat
2017 · Writer, Creator
tvMilo Murphy's Law
2016 · Additional Voices (voice), Executive Producer, Story, Creator
movieTV's Funniest Animated Stars: A Paley Center for Media Special
2015 · Self
movieO.W.C.A. Files
2015 · Major Monogram / Additional Voices (voice), Executive Producer
moviePhineas and Ferb: Last Day of Summer
2015 · Major Monogram (voice)
moviePhineas and Ferb: Night of the Living Pharmacists
2014 · Major Francis Monogram (voice)
moviePhineas and Ferb: Star Wars
2014 · Major Hologram / Imperial Officer Jeff / Additional Voices
moviePhineas and Ferb Save Summer
2014 · Major Francis Monogram / Additional Voices (voice)
movieI Know That Voice
2014 · Self
moviePhineas and Ferb: Mission Marvel
2013 · Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
moviePhineas and Ferb: The Perry Files - Animal Agents
2013 · Major Monogram (voice)
moviePhineas and Ferb: The Daze of Summer
2012 · , Writer
moviePhineas and Ferb The Movie: Across the 2nd Dimension
2011 · Major Francis Monogram / Monogram-2 (voice), Sequence Supervisor, Executive Producer, Writer
tvTake Two with Phineas and Ferb
2010 · Executive Producer, Creator
moviePhineas and Ferb: Summer Belongs to You!
2010 · Major Francis Monogram / Additional Voices (voice), Story, Additional Writing
moviePhineas and Ferb Christmas Vacation!
2009 · Major Monogram (voice), Producer
tvPhineas and Ferb
2007 · Francis Monogram (voice), Director, Executive Producer, Writer, Story, Creator
tvShadow of the Elves
2004 · Director
tvBounty Hamster
2003 · (voice)
tvAaagh! It's the Mr. Hell Show!
2001 · Josh (voice)
movieLooks Can Kill
1994 · Associate Producer
tvRocko's Modern Life
1993 · Storyboard Artist, Director, Additional Writing
movieUntitled Phineas and Ferb Movie
— · Major Francis Monogram (voice), Writer, Executive Producer