Jeff 'Swampy' Marsh

Actor

Born: December 9, 1960 (age 65)
From: Santa Monica, California, USA

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,…

Filmography (16)

Spiked (2025)
Big Boss Croc / Exterminator (voice)
Phineas and Ferb the Movie: Candace Against the Universe (2020)
Major Monogram (voice)
TV's Funniest Animated Stars: A Paley Center for Media Special (2015)
Self
O.W.C.A. Files (2015)
Major Monogram / Additional Voices (voice)
Phineas and Ferb: Last Day of Summer (2015)
Major Monogram (voice)
Phineas and Ferb: Night of the Living Pharmacists (2014)
Major Francis Monogram (voice)
Phineas and Ferb: Star Wars (2014)
Major Hologram / Imperial Officer Jeff / Additional Voices
Phineas and Ferb Save Summer (2014)
Major Francis Monogram / Additional Voices (voice)
I Know That Voice (2014)
Self
Phineas and Ferb: Mission Marvel (2013)
Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
Phineas and Ferb: The Perry Files - Animal Agents (2013)
Major Monogram (voice)
Phineas and Ferb: The Daze of Summer (2012)
Phineas and Ferb The Movie: Across the 2nd Dimension (2011)
Major Francis Monogram / Monogram-2 (voice)
Phineas and Ferb: Summer Belongs to You! (2010)
Major Francis Monogram / Additional Voices (voice)
Phineas and Ferb Christmas Vacation! (2009)
Major Monogram (voice)
Untitled Phineas and Ferb Movie
Major Francis Monogram (voice)