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.
16
Films
6
TV Shows
9
Crew Credits
Known For
22 Credits
Phineas and Ferb
as Francis Monogram (voice)
2007
Milo Murphy's Law
as Additional Voices (voice)
2016
Bounty Hamster
as (voice)
2003
Phineas and Ferb The Movie: Across the 2nd Dimension
as Major Francis Monogram / Monogram-2 (voice)
2011
How NOT to Draw
as Major Monogram (voice)
2022
Phineas and Ferb the Movie: Candace Against the Universe
as Major Monogram (voice)
2020
Phineas and Ferb: Star Wars
as Major Hologram / Imperial Officer Jeff / Additional Voices
2014
Phineas and Ferb: The Daze of Summer
2012
Aaagh! It's the Mr. Hell Show!
as Josh (voice)
2001
Phineas and Ferb: Mission Marvel
as Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
2013
Spiked
as (voice)
2025
Phineas and Ferb: Summer Belongs to You!
as Major Francis Monogram (voice) / Additional Voices
2010
Behind the Camera
9 CreditsPhineas and Ferb
Director, Writer
2007
Rocko's Modern Life
Director
1993
Pete the Cat
Writer
2017
Phineas and Ferb The Movie: Across the 2nd Dimension
Writer
2011
Phineas and Ferb the Movie: Candace Against the Universe
Writer
2020
Phineas and Ferb: The Daze of Summer
Writer
2012
Shadow of the Elves
Director
2004
Phineas and Ferb Christmas Vacation!
Producer
2009
Untitled Phineas and Ferb Movie
Writer