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

HD

Spiked

2025 ⭐ 8.0

HD

Phineas and Ferb the Movie: Candace Against the Universe

2020 ⭐ 7.2

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O.W.C.A. Files

2015 ⭐ 7.5

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Phineas and Ferb: Last Day of Summer

2015 ⭐ 8.0

Career timeline

2025

Spiked Notable

Big Boss Croc / Exterminator ( · 2025

⭐ 8.0

2020

Phineas and Ferb the Movie: Candace Against the Universe Notable

Major Monogram (voice) · 2020

⭐ 7.2

2015

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

Self · 2015

O.W.C.A. Files Notable

Major Monogram / Additional Vo · 2015

⭐ 7.5

Phineas and Ferb: Last Day of Summer Notable

Major Monogram (voice) · 2015

⭐ 8.0

2014

Phineas and Ferb: Night of the Living Pharmacists Notable

Major Francis Monogram (voice) · 2014

⭐ 7.9

Phineas and Ferb: Star Wars Notable

Major Hologram / Imperial Offi · 2014

⭐ 7.2

Phineas and Ferb Save Summer Notable

Major Francis Monogram / Addit · 2014

⭐ 8.0

2013

Phineas and Ferb: Mission Marvel

Francis Major Monogram / Gordo · 2013

⭐ 6.6

Phineas and Ferb: The Perry Files - Animal Agents Notable

Major Monogram (voice) · 2013

⭐ 8.4

2012

Phineas and Ferb: The Daze of Summer Notable

2012

⭐ 7.0

2011

Phineas and Ferb The Movie: Across the 2nd Dimension Notable

Major Francis Monogram / Monog · 2011

⭐ 7.1

2010

Phineas and Ferb: Summer Belongs to You! Notable

Major Francis Monogram / Addit · 2010

⭐ 7.8

2009

Phineas and Ferb Christmas Vacation! Notable

Major Monogram (voice) · 2009

⭐ 7.3

Frequently appears with

Matthew Goode

Walter / Sir Balderdash (

Kíla Lord Cassidy

Holly (voice)

Gemma Whelan

Twinkles (voice)

Stephen Mangan

Great Owl (voice)

Ashley French

Candace Flynn (voice)

Vincent Martella

Phineas Flynn (voice)

David Errigo Jr.

Ferb Fletcher (voice)

Dan Povenmire

Dr. Doofenshmirtz (voice)

Olivia Olson

Vanessa Doofenshmirtz (vo

Full filmography

HD

Spiked

2025 ⭐ 8.0

HD

Phineas and Ferb the Movie: Candace Against the Universe

2020 ⭐ 7.2

HD

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

2015

HD

O.W.C.A. Files

2015 ⭐ 7.5

HD

Phineas and Ferb: Last Day of Summer

2015 ⭐ 8.0

HD

Phineas and Ferb: Night of the Living Pharmacists

2014 ⭐ 7.9

HD

Phineas and Ferb: Star Wars

2014 ⭐ 7.2

HD

Phineas and Ferb Save Summer

2014 ⭐ 8.0

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I Know That Voice

2014 ⭐ 7.1

HD

Phineas and Ferb: Mission Marvel

2013 ⭐ 6.6

HD

Phineas and Ferb: The Perry Files - Animal Agents

2013 ⭐ 8.4

HD

Phineas and Ferb: The Daze of Summer

2012 ⭐ 7.0

HD

Phineas and Ferb The Movie: Across the 2nd Dimension

2011 ⭐ 7.1

HD

Phineas and Ferb: Summer Belongs to You!

2010 ⭐ 7.8

HD

Phineas and Ferb Christmas Vacation!

2009 ⭐ 7.3

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Untitled Phineas and Ferb Movie