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Jeff 'Swampy' Marsh

Personal Info

Known For

Acting

Born

December 9, 1960 (age 65)

Place of Birth

Santa Monica, California, USA

Also Known As

Jeff "Swampy" Marsh

Jeff Harsh

Jeff Swampy Marsh

Jeffrey Marsh

Jeff Marsh

Jeff 'Swampy' Marsh

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.

Known For

Phineas and Ferb

Phineas and Ferb

Francis Monogram (voice)

2007

Milo Murphy's Law

Milo Murphy's Law

Additional Voices (voice)

2016

Bounty Hamster

Bounty Hamster

(voice)

2003

Agent P Under C

Agent P Under C

Major Monogram (voice)

2026

How Not to Draw

How Not to Draw

Major Monogram (voice)

2022

Phineas and Ferb The Movie: Across the 2nd Dimension

Phineas and Ferb The Movie: Across the 2nd Dimension

Major Francis Monogram / Monogram-2 (voice)

2011

Aaagh! It's the Mr. Hell Show!

Aaagh! It's the Mr. Hell Show!

Josh (voice)

2001

Phineas and Ferb the Movie: Candace Against the Universe

Phineas and Ferb the Movie: Candace Against the Universe

Major Monogram (voice)

2020

Phineas and Ferb: Mission Marvel

Phineas and Ferb: Mission Marvel

Francis Major Monogram / Gordon Gutsofanemu / Additional Voices

2013

Phineas and Ferb: Star Wars

Phineas and Ferb: Star Wars

Major Hologram / Imperial Officer Jeff / Additional Voices

2014

I Know That Voice

I Know That Voice

Self

2014

Phineas and Ferb: Summer Belongs to You!

Phineas and Ferb: Summer Belongs to You!

Major Francis Monogram (voice) / Additional Voices

2010

Spiked

Spiked

(voice)

2025

O.W.C.A. Files

O.W.C.A. Files

Major Monogram / Additional Voices (voice)

2015

Phineas and Ferb: The Daze of Summer

Phineas and Ferb: The Daze of Summer

2012

Phineas and Ferb Christmas Vacation!

Phineas and Ferb Christmas Vacation!

Major Monogram (voice)

2009

Phineas and Ferb: Night of the Living Pharmacists

Phineas and Ferb: Night of the Living Pharmacists

Major Francis Monogram (voice)

2014

Phineas and Ferb Save Summer

Phineas and Ferb Save Summer

Major Francis Monogram / Additional Voices (voice)

2014

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

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

Self

2015

Phineas and Ferb: Last Day of Summer

Phineas and Ferb: Last Day of Summer

Major Monogram (voice)

2015

Filmography

2026TVAgent P Under Cas Major Monogram (voice)2025FilmSpikedas (voice)2022TVHow Not to Drawas Major Monogram (voice)2020FilmPhineas and Ferb the Movie: Candace Against the Universeas Major Monogram (voice)2016TVMilo Murphy's Lawas Additional Voices (voice)2015FilmTV's Funniest Animated Stars: A Paley Center for Media Specialas Self 2015FilmO.W.C.A. Filesas Major Monogram / Additional Voices (voice)2015FilmPhineas and Ferb: Last Day of Summeras Major Monogram (voice)2014FilmPhineas and Ferb: Night of the Living Pharmacistsas Major Francis Monogram (voice)2014FilmPhineas and Ferb: Star Warsas Major Hologram / Imperial Officer Jeff / Additional Voices 2014FilmPhineas and Ferb Save Summeras Major Francis Monogram / Additional Voices (voice)2014FilmI Know That Voiceas Self 2013FilmPhineas and Ferb: Mission Marvelas Francis Major Monogram / Gordon Gutsofanemu / Additional Voices 2013FilmPhineas and Ferb: The Perry Files - Animal Agentsas Major Monogram (voice)2012FilmPhineas and Ferb: The Daze of Summer 2011FilmPhineas and Ferb The Movie: Across the 2nd Dimensionas Major Francis Monogram / Monogram-2 (voice)2010FilmPhineas and Ferb: Summer Belongs to You!as Major Francis Monogram (voice) / Additional Voices 2009FilmPhineas and Ferb Christmas Vacation!as Major Monogram (voice)2007TVPhineas and Ferbas Francis Monogram (voice)2003TVBounty Hamsteras (voice)2001TVAaagh! It's the Mr. Hell Show!as Josh (voice)—FilmUntitled Phineas and Ferb Movieas Major Francis Monogram (voice)