
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.

Self
TV's Funniest Animated Stars: A Paley Center for Media Special

Major Francis Monogram / Monogram-2 (voice)
Phineas and Ferb The Movie: Across the 2nd Dimension

Major Monogram / Additional Voices (voice)
O.W.C.A. Files

Major Francis Monogram (voice)
Phineas and Ferb: Night of the Living Pharmacists

Major Monogram (voice)
Phineas and Ferb Christmas Vacation!

Major Monogram (voice)
Phineas and Ferb: The Perry Files - Animal Agents

Phineas and Ferb: The Daze of Summer

Major Francis Monogram (voice) / Additional Voices
Phineas and Ferb: Summer Belongs to You!

Major Monogram (voice)
Phineas and Ferb: Last Day of Summer

Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
Phineas and Ferb: Mission Marvel

Major Hologram / Imperial Officer Jeff / Additional Voices
Phineas and Ferb: Star Wars

Self
I Know That Voice

Major Monogram (voice)
Phineas and Ferb the Movie: Candace Against the Universe

Major Francis Monogram / Additional Voices (voice)
Phineas and Ferb Save Summer

(voice)
Allez Hëpp Hopp Hopp!
Known For
Acting
Known Credits
15
Gender
Male
Birthday
1960-12-09
Place of Birth
Santa Monica, California, USA
Also Known As
Jeff "Swampy" Marsh