Jeff 'Swampy' Marsh

Known for

Acting

Born

December 9, 1960 (age 65)

Birthplace

Santa Monica, California, USA

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 Hi...

Best known work

Phineas and Ferb

2007

Phineas and Ferb the Movie: Across the 2nd Dimension

2011

Phineas and Ferb the Movie: Candace Against the Universe

2020

Rocko's Modern Life

1993

Phineas and Ferb: Star Wars

2014

Phineas and Ferb: Mission Marvel

2013

I Know That Voice

2014

Milo Murphy's Law

2016

Take Two with Phineas and Ferb

2010

Phineas and Ferb: The Perry Files - Animal Agents

2013

Filmography

TBA
Untitled Phineas and Ferb Movie
as Major Francis Monogram (voice), Writer, Executive Producer
2026
Agent P Under CTV
as Major Monogram (voice) (8 episodes)
2026
Hey A.J.!TV
Executive Producer
2025
Cartoonified! With Phineas and FerbTV
Creator
2025
Spiked
as Big Boss Croc / Exterminator (voice)
2024
Super Happy Magic ForestTV
Executive Producer
2022
How Not to DrawTV
as Major Monogram (voice) (1 episode)
2020
Phineas and Ferb the Movie: Candace Against the Universe
as Major Monogram (voice), Executive Producer, Writer
2017
Pete the CatTV
Writer, Creator
2016
Milo Murphy's LawTV
as Additional Voices (voice) (73 episodes), Executive Producer, Story, Creator
2015
TV's Funniest Animated Stars: A Paley Center for Media Special
as Self
2014
Phineas and Ferb: Star Wars
as Major Hologram / Imperial Officer Jeff / Additional Voices
2014
I Know That Voice
as Self
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
Phineas and Ferb: The Daze of Summer
Writer
2011
Phineas and Ferb the Movie: Across the 2nd Dimension
as Major Francis Monogram / Monogram-2 (voice), Sequence Supervisor, Executive Producer, Writer
2010
Take Two with Phineas and FerbTV
Executive Producer, Creator
2007
Phineas and FerbTV
as Francis Monogram (voice) (263 episodes), Writer, Director, Executive Producer, Story, Creator
2004
Shadow of the ElvesTV
Director
2003
Bounty HamsterTV
as (voice) (1 episode)
2001
Aaagh! It's the Mr. Hell Show!TV
as Josh (voice) (13 episodes)
1994
Looks Can Kill
Associate Producer
1993
Rocko's Modern LifeTV
Storyboard Artist, Additional Writing, Director