Jeff 'Swampy' Marsh
Actor
Biography
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
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: Mission Marvel
as Francis Major Monogram / Gordon Gutsofanemu / Additional Voices 2013
I Know That Voice
as Self 2014
Phineas and Ferb: Summer Belongs to You!
as Major Francis Monogram (voice) / Additional Voices 2010
Phineas and Ferb: Last Day of Summer
as Major Monogram (voice) 2015
Phineas and Ferb Christmas Vacation!
as Major Monogram (voice) 2009
Phineas and Ferb: The Perry Files - Animal Agents
as Major Monogram (voice) 2013
Phineas and Ferb: The Daze of Summer
2012
O.W.C.A. Files
as Major Monogram / Additional Voices (voice) 2015
Phineas and Ferb: Night of the Living Pharmacists
as Major Francis Monogram (voice) 2014
Phineas and Ferb Save Summer
as Major Francis Monogram / Additional Voices (voice) 2014
Spiked
as (voice) 2025
TV's Funniest Animated Stars: A Paley Center for Media Special
as Self 2015