Jeff 'Swampy' Marsh

Writer
Actor
Producer

Phineas and Ferb invent, scheme, and stay one step ahead of their bratty sister. Meanwhile, their pet platypus plots against evil Dr. Doofenshmirtz.

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Phineas and Ferb (2007– )

Jeff Swampy Marsh is an American voice actor, animator, cartoonist, singer and writer from California. He co-created Phineas & Ferb and Milo Murphy's Law alongside Dan Povenmire. He also worked on various episodes of Family Guy, Rocko's Modern Life and SpongeBob SquarePants. He is known for voicing Major Monogram, who is essentially an equivalent of Nick Fury for Perry the Platypus in Phineas & Ferb.

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Nominated for 6 Primetime Emmys
- 3 wins & 16 nominations total

Photos6

Known for

Pete the Cat

7.7

TV Series

Writer

Milo Murphy's Law

7.6

TV Series

Writer(creator)

Credits

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Writer

Phineas and Ferb
8.1
TV Series
- created by
- creator
- story by (uncredited) ...
- 2007–2025
Pete the Cat
7.7
TV Series
- written by
- developed by
- 2017–2021
Phineas and Ferb the Movie: Candace Against the Universe
7.0
- written by
- created by
- 2020
Milo Murphy's Law
7.6
TV Series
- created by
- story by (segment "Going the Extra Milo")
- 2016–2019
Disney Infinity 3.0
7.4
Video Game
- characters: Phineas Flynn, Agent P
- 2015
Disney Infinity: Marvel Super Heroes
6.9
Video Game
- characters: Phineas Flynn, Agent P
- 2014
Disney Infinity
7.4
Video Game
- characters: Phineas Flynn, Agent P
- 2013
Phineas and Ferb the Movie: Across the 2nd Dimension
7.4
TV Movie
- written by
- 2011
Dodger Etiquette Song
Short
- written by
- 2010
Phineas and Ferb
Short
- Writer
- 2006
Rocko's Modern Life
7.9
TV Series
- additional writing
- 1993–1996

Actor

Phineas and Ferb
8.1
TV Series
- Major Francis Monogram
- Additional Voices
- Dink Winkerson ...
- 2007–2025
Spiked
5.6
- Croc
- Exterminator
- 2025
Disney How NOT to Draw
7.4
TV Series
- Major Monogram (voice)
- 2025
Hamster & Gretel
6.9
TV Series
- Additional Voices
- Old Man
- 2022–2023
Pete the Cat
7.7
TV Series
- Pete's Dad
- 2020–2022
Karma's World Virtual Premiere Party
Video
- Major Monogram
- 2021
M.W.C.A. (Musical Without a Cool Acronym): Virtual Edition
9.0
Video
- The Director
- 2021
Phineas and Ferb the Movie: Candace Against the Universe
7.0
- Major Monogram
- Self
- Alien Driver (voice) ...
- 2020
Milo Murphy's Law
7.6
TV Series
- Cavendish
- Cavenpus
- Additional Voices ...
- 2016–2019
Better Things
7.9
TV Series
- Director
- Writer Guy
- 2016
Ronja, the Robber's Daughter
7.0
TV Series
- Musician B
- 2014–2015
Phineas and Ferb: Star Wars
7.5
TV Special
- Major Hologram
- Additional Voices
- 2014
Phineas and Ferb: Mission Marvel
7.0
TV Special
- Major Monogram
- Additional Voices
- 2013
Phineas and Ferb the Movie: Across the 2nd Dimension
7.4
TV Movie
- Major Francis Monogram
- Monogram-2
- Tow Truck Driver (voice, as Swampy Marsh) ...
- 2011
Phineas and Ferb: Across the 2nd Dimension
7.7
Video Game
- Major Francis Monogram (voice)
- 2011

Producer

Phineas and Ferb
8.1
TV Series
- executive producer
- co-executive producer
- 2007–2025
Pete the Cat
7.7
TV Series
- executive producer
- 2017–2022
Phineas and Ferb the Movie: Candace Against the Universe
7.0
- executive producer
- 2020
Milo Murphy's Law
7.6
TV Series
- executive producer
- 2016–2019
Take Two with Phineas and Ferb
6.1
TV Series
- executive producer
- 2010–2011
Phineas and Ferb the Movie: Across the 2nd Dimension
7.4
TV Movie
- executive producer
- 2011
Phineas and Ferb
Short
- executive producer
- 2006
Looks Can Kill
6.0
Short
- associate producer
- 1994
Collet .45
Short
- producer
- 1993