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Jeff 'Swampy' Marsh

  • Writer
  • Actor
  • Producer
IMDbProStarmeterSee rank
Jeff 'Swampy' Marsh
Phineas and Ferb invent, scheme, and stay one step ahead of their bratty sister. Meanwhile, their pet platypus plots against evil Dr. Doofenshmirtz.
Play trailer1:10
Phineas and Ferb (2007– )
10 Videos
7 Photos
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.
BornDecember 9, 1960
  • More at IMDbPro
    • Contact info
    • Agent info
    • Resume
BornDecember 9, 1960
IMDbProStarmeterSee rank
  • View contact info at IMDbPro
    • Nominated for 6 Primetime Emmys
      • 3 wins & 16 nominations total

    Photos6

    View Poster
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    Known for

    Pete the Cat (2017)
    Pete the Cat
    7.8
    TV Series
    • Writer(creator)
    Milo Murphy's Law (2016)
    Milo Murphy's Law
    7.5
    TV Series
    • Writer(creator)

    Credits

    IMDbPro

    Writer

    • Phineas and Ferb
      • creator
      • Released
      • TV Series
      • 2026
    • Untitled Third Phineas and Ferb Movie
      • story by
      • screenplay
      • creator
      • Pre-production
    • Hey A.J.! (2026)
      Hey A.J.!
      7.5
      TV Series
      • created by
      • 2026
    • Dee Bradley Baker, Thomas Brodie-Sangster, and Vincent Martella in Phineas and Ferb (2007)
      Phineas and Ferb
      8.1
      TV Series
      • created by
      • creator
      • story by (uncredited) ...
      • 2007–2026
    • Pete the Cat (2017)
      Pete the Cat
      7.8
      TV Series
      • written by
      • developed by
      • 2017–2021
    • Phineas and Ferb the Movie: Candace Against the Universe (2020)
      Phineas and Ferb the Movie: Candace Against the Universe
      7.0
      • written by
      • created by
      • 2020
    • Milo Murphy's Law (2016)
      Milo Murphy's Law
      7.5
      TV Series
      • created by
      • story by
      • creator (segment "Going the Extra Milo")
      • 2016–2019
    • Ashley Eckstein, Anna Graves, Tom Kane, James Arnold Taylor, Sam Witwer, John Armstrong, Matt Sloan, Lloyd Floyd, and Matt Lanter in Disney Infinity 3.0 (2015)
      Disney Infinity 3.0
      7.4
      Video Game
      • characters: Phineas Flynn, Agent P
      • 2015
    • Adrian Pasdar, Fred Tatasciore, Travis Willingham, Laura Bailey, Troy Baker, and Roger Craig Smith in Disney Infinity: Marvel Super Heroes (2014)
      Disney Infinity: Marvel Super Heroes
      6.9
      Video Game
      • characters: Phineas Flynn, Agent P
      • 2014
    • Holly Hunter, Chris Sarandon, Jason Lee, Carlos Alazraqui, Dee Bradley Baker, Kat Cressida, Brian George, Jim Hanks, Joel McCrary, Richard McGonagle, Emily Mortimer, Bill Nighy, Sarah Vowell, Larry the Cable Guy, Brian T. Delaney, Mike MacRae, Keith Ferguson, Vincent Martella, Roger Craig Smith, Raymond Ochoa, and Jared Butler in Disney Infinity (2013)
      Disney Infinity
      7.3
      Video Game
      • characters: Phineas Flynn, Agent P
      • 2013
    • Phineas and Ferb the Movie: Across the 2nd Dimension (2011)
      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 (2006)
      Phineas and Ferb
      Short
      • Writer
      • 2006
    • Carlos Alazraqui in Rocko's Modern Life (1993)
      Rocko's Modern Life
      7.9
      TV Series
      • additional writing
      • 1993–1996

    Actor

    • Phineas and Ferb
      • Major Francis Monogram
      • Additional Voices
      • Man #1 ...
      • Released
      • TV Series
      • 2026
    • Untitled Third Phineas and Ferb Movie
      • Major Francis Monogram (voice)
      • Pre-production
    • Agent P, Under C (2026)
      Agent P, Under C
      7.6
      TV Series
      • Major Monogram (voice)
      • 2026
    • Dee Bradley Baker, Thomas Brodie-Sangster, and Vincent Martella in Phineas and Ferb (2007)
      Phineas and Ferb
      8.1
      TV Series
      • Major Francis Monogram
      • Additional Voices
      • Man #1 ...
      • 2007–2026
    • Theme Song Takeover (2019)
      Theme Song Takeover
      7.0
      TV Series
      • Major Monogram (voice)
      • 2026
    • Spiked (2025)
      Spiked
      5.1
      • Croc
      • Exterminator
      • 2025
    • Disney How NOT to Draw (2022)
      Disney How NOT to Draw
      7.1
      TV Series
      • Major Monogram (voice)
      • 2025
    • Hamster & Gretel (2022)
      Hamster & Gretel
      6.8
      TV Series
      • Additional Voices
      • Old Man
      • 2022–2023
    • Pete the Cat (2017)
      Pete the Cat
      7.8
      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 (2021)
      M.W.C.A. (Musical Without a Cool Acronym): Virtual Edition
      9.1
      Video
      • The Director
      • 2021
    • Phineas and Ferb the Movie: Candace Against the Universe (2020)
      Phineas and Ferb the Movie: Candace Against the Universe
      7.0
      • Major Monogram
      • Self
      • Alien Driver (voice) ...
      • 2020
    • Milo Murphy's Law (2016)
      Milo Murphy's Law
      7.5
      TV Series
      • Additional Voices
      • Cavendish
      • Balthazar Cavendish ...
      • 2016–2019
    • Pamela Adlon in Better Things (2016)
      Better Things
      7.9
      TV Series
      • Director
      • Writer Guy
      • 2016
    • Ronja, the Robber's Daughter (2014)
      Ronja, the Robber's Daughter
      7.0
      TV Series
      • Musician B
      • 2014–2015
    • Phineas and Ferb: Star Wars (2014)
      Phineas and Ferb: Star Wars
      7.5
      TV Special
      • Major Hologram
      • Additional Voices
      • 2014
    • Phineas and Ferb: Mission Marvel (2013)
      Phineas and Ferb: Mission Marvel
      6.9
      TV Special
      • Major Monogram
      • Additional Voices
      • 2013

    Producer

    • Phineas and Ferb
      • executive producer
      • Released
      • TV Series
      • 2026
    • Untitled Third Phineas and Ferb Movie
      • executive producer
      • Pre-production
    • Hey A.J.! (2026)
      Hey A.J.!
      7.5
      TV Series
      • executive producer
      • 2026
    • Dee Bradley Baker, Thomas Brodie-Sangster, and Vincent Martella in Phineas and Ferb (2007)
      Phineas and Ferb
      8.1
      TV Series
      • executive producer
      • co-executive producer
      • 2007–2026
    • Pete the Cat (2017)
      Pete the Cat
      7.8
      TV Series
      • executive producer
      • 2017–2022
    • Phineas and Ferb the Movie: Candace Against the Universe (2020)
      Phineas and Ferb the Movie: Candace Against the Universe
      7.0
      • executive producer
      • 2020
    • Milo Murphy's Law (2016)
      Milo Murphy's Law
      7.5
      TV Series
      • executive producer
      • 2016–2019
    • Take Two with Phineas and Ferb (2010)
      Take Two with Phineas and Ferb
      6.1
      TV Series
      • executive producer
      • 2010–2011
    • Phineas and Ferb the Movie: Across the 2nd Dimension (2011)
      Phineas and Ferb the Movie: Across the 2nd Dimension
      7.4
      TV Movie
      • executive producer
      • 2011
    • Phineas and Ferb (2006)
      Phineas and Ferb
      Short
      • executive producer
      • 2006
    • Looks Can Kill
      6.0
      Short
      • associate producer
      • 1994
    • Collet .45 (1993)
      Collet .45
      Short
      • producer
      • 1993
    • In-development projects at IMDbPro

    Videos10

    Phineas and Ferb: Across the 2nd Dimension
    Clip 0:48
    Phineas and Ferb: Across the 2nd Dimension
    Phineas and Ferb: Across the 2nd Dimension
    Clip 1:38
    Phineas and Ferb: Across the 2nd Dimension
    Phineas and Ferb: Across the 2nd Dimension
    Clip 1:38
    Phineas and Ferb: Across the 2nd Dimension
    Phineas and Ferb: Across the 2nd Dimension
    Clip 0:43
    Phineas and Ferb: Across the 2nd Dimension
    Phineas and Ferb: Across the 2nd Dimension
    Clip 1:16
    Phineas and Ferb: Across the 2nd Dimension
    Phineas and Ferb: Across the 2nd Dimension
    Clip 0:40
    Phineas and Ferb: Across the 2nd Dimension
    Phineas and Ferb: Across the 2nd Dimension
    Clip 0:48
    Phineas and Ferb: Across the 2nd Dimension

    Personal details

    • Official site
      • X
    • Alternative names
      • Jeff Harsh
    • Height
      • 5′ 8″ (1.73 m)
    • Born
      • December 9, 1960
      • Santa Monica, California, USA
    • Spouse
      • BirgitteDecember 17, 2006 - present (2 children)
    • Children
      • Django Marsh
    • Relatives
        Les Brown Jr.(Aunt or Uncle)

    Did you know

    • Trivia
      It took 16 years of Dan Povenmire and he pitching the show, Phineas and Ferb (2007), to everyone before Disney put the show on the air.

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