JM
Jeff 'Swampy' Marsh
Actor, Director, Producer, Writer, Additional CreditsBorn December 9, 1960 (64 years)
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.
Jeff 'Swampy' Marsh Filmography
| 2022 | How NOT to Draw (TV Series) · as Major Monogram (voice) |
| 2022 | Hamster & Gretel (TV Series) · as Additional Voices |
| 2020 | Phineas and Ferb the Movie: Candace Against the Universe · as Major Monogram (voice) |
| 2017 | Pete the Cat (TV Series) · as Pete's Dad |
| 2016 | Milo Murphy's Law (TV Series) · as Additional Voices (voice) |
| 2016 | Better Things (TV Series) · as Director |
| 2015 | O.W.C.A. Files · as Major Monogram / Additional Voices (voice) |
| 2015 | Phineas and Ferb: Last Day of Summer · as Major Monogram (voice) |
| 2014 | Ronja, the Robber's Daughter (2014) (TV Series) · as Musician B |
| 2014 | Phineas and Ferb: Night of the Living Pharmacists · as Major Francis Monogram (voice) |
| 2014 | Phineas and Ferb: Star Wars · as Major Hologram / Imperial Officer Jeff / Additional Voices |
| 2014 | Phineas and Ferb: Star Wars · as Major Hologram |
| 2014 | Phineas and Ferb Save Summer · as Major Francis Monogram / Additional Voices (voice) |
| 2013 | Phineas and Ferb: Mission Marvel · as Francis Major Monogram / Gordon Gutsofanemu / Additional Voices |
| 2013 | Phineas and Ferb: The Perry Files - Animal Agents · as Major Monogram (voice) |
| 2012 | |
| 2011 | Phineas and Ferb the Movie: Across the 2nd Dimension · as Major Francis Monogram / Monogram-2 (voice) |
| 2010 | Phineas and Ferb: Summer Belongs to You! · as Major Francis Monogram (voice) / Additional Voices |
| 2009 | Phineas and Ferb Christmas Vacation! · as Major Monogram (voice) |
| 2007 | Phineas and Ferb (TV Series) · as Francis Monogram (voice) |
| 2003 | Bounty Hamster (TV Series) · as (voice) |
| 2000 | Aaagh! It's the Mr. Hell Show!!! (TV Series) · as Josh (voice) |
| 2018 | Enchantimals: Tales From Everwilde (TV Series) |
| 2017 | Pete the Cat (TV Series) |
| 2011 | |
| 2007 | Phineas and Ferb (TV Series) |
| 2004 | Shadow Of The Elves (TV Series) |
| 1993 | Rocko's Modern Life (TV Series) |
| 2026 | Hey A.J.! (TV Series) · as Executive Producer |
| 2024 | Super Happy Magic Forest (TV Series) · as Executive Producer |
| 2020 | Phineas and Ferb the Movie: Candace Against the Universe · as Executive Producer |
| 2017 | Pete the Cat (TV Series) · as Executive Producer |
| 2016 | Milo Murphy's Law (TV Series) · as Executive Producer |
| 2015 | O.W.C.A. Files · as Executive Producer |
| 2011 | Phineas and Ferb the Movie: Across the 2nd Dimension · as Executive Producer |
| 2010 | Take Two with Phineas and Ferb (TV Series) · as Executive Producer |
| 2009 | |
| 2007 | Phineas and Ferb (TV Series) · as Executive Producer |
| 2017 | Pete the Cat (TV Series) |
| 2012 | |
| 2011 | |
| 2007 | Phineas and Ferb (TV Series) |
| 2017 | Talkin' Toons (TV Series) · as Self - Panelist |
| 2013 | I Know That Voice · as Self |
| 2010 | Piper's QUICK Picks (TV Series) · as Self - Guest |
| 2008 | Piper's Picks TV (TV Series) · as Self - Guest |
| 2020 | Phineas and Ferb the Movie: Candace Against the Universe · as Characters |
| 2016 | Milo Murphy's Law (TV Series) · as Story |
| 2014 | Phineas and Ferb: Star Wars · as Characters |
| 2013 | Phineas and Ferb: Mission Marvel · as Characters |
| 2010 | Phineas and Ferb: Summer Belongs to You! · as Story |
| 2005 | Legend of the Dragon (TV Series) · as Supervising Art Director |
| 2000 | Aaagh! It's the Mr. Hell Show!!! (TV Series) · as Art Director |
| 1993 | Rocko's Modern Life (TV Series) · as Additional Writing |