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Jeff "Swampy" Marsh
Swampy Marsh with Dan Povenmire at a press release for Last Day of Summer.
Birth Name
Jeffrey K. Marsh
Gender   Male
Date of birth
December (1960-12-09) 9, 1960 (age 58)
Place of birth
Santa Monica, CA
Characters portrayed
Balthazar Cavendish
Francis Monogram
Armory Security Guard
Lieutenant Tennant
Other projects
Rocko's Modern Life (Writer and Director)
Aaagh! It's the Mr. Hell Show! (Art Director/Voice "Josh, the reincarnation guy")
Bounty Hamster (Voice, various)
King of the Hill (Property Designer)
The Simpsons
(Storyboard Artist/Background Layout Artist)
Phineas and Ferb (Co-Creator)

Jeffrey K. Marsh[1] also known as Jeff "Swampy" Marsh and Swampy (born December 9, 1960) was a director and one of the writers of the '90s nicktoon Rocko's Modern Life. Co-creator of Phineas and Ferb with Dan Povenmire, he has directed, written, and acted in this hit Disney Channel and Disney XD original series. In Phineas and Ferb, he portrays the voice of Major Monogram, commander of Perry the Platypus.

From the show's inception, Marsh has been one of the main songwriters for the series, along with Dan Povenmire as well as Martin Olson.

After Phineas and Ferb ended production, Dan and Swampy went on to create Milo Murphy's Law premiering on Disney XD in October 2016. He also voices Balthazar Cavendish, Cavenpuss, Armory Security Guard, Lieutenant Tennant, and Mantel.

Episodes he wrote


  • During the time in England, friends began calling him "Swampy" and "Boggy", playing off of his last name. He told them that he did not want to be called "Boggy". After his return to the United States, other friends heard of his nickname and also began calling him "Swampy". After a while, Jeff began to like it.[2]
  • He is the grandson of world-renown bandleader and songwriter Les Brown.[2]
  • Currently married; wife of Dutch descent, which explains why Phineas and Ferb has so many references to the Netherlands, such as Buford Van Stomm's last name, Florraine from Imperfect Storm only speaking Dutch, and Paolo Vanderbeek being part-Dutch.[3]
  • As for Phineas and Ferb, he appears as himself in Tri-Stone Area, Phineas and Ferb: Star Wars, and Act Your Age.






  2. 2.0 2.1 Piper's Picks TV #031.

External links

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v - e - d Crew
Creators Jeff "Swampy" MarshDan Povenmire
Writers Jim BernsteinJeff "Swampy" MarshDan PovenmireKyle MenkeMartin OlsonScott PetersonJoshua PruettDani VetereMarja AdrianceValerie Breiman
Storyboard Artists Jacob HairDiana HuhKyle MenkeDan PovenmireEdward RiveraJoseph S. ScottAshley Michelle SimpsonCalvin SuggsSteven UmblebyChris YbarraLauren Andrews
Directors Bob BowenRobert F. HughesDan Povenmire
v - e - d Cast
Main Cast Al YankovicMekai CurtisSabrina CarpenterKate MicucciPamela AdlonDiedrich BaderJeff "Swampy" MarshDan PovenmireChrissie FitChristian SlaterJemaine ClementBrett DaltonMing-Na WenMark HamillRhys DarbyGreg CipesDjango Marsh
Voice Actors Danica McKellarMichael CulrossSarah ChalkeAdrian PasdarVanessa WilliamsPhil LaMarrKevin Michael RichardsonLaraine NewmanMackenzie PhillipsPeter StormareTyler Alexander MannMaulik PancholyAshley TisdaleAlyson StonerMitchel MussoVincent MartellaDavid Errigo Jr.Bobby GaylorOlivia OlsonFred WillardShelley LongGrey GriffinSophie WinklemanJohn HodgmanJack McBrayerBarry BostwickJoel McHaleEileen GalindoDebbon AyerRob MorrowRomi DamesLeah ReminiLandry BenderWayne BradyAriel WinterSam LavagninoThomas LennonHaley TjuClancy BrownJim HanksPeter FondaCaroline Rhea
Jeff BennettCarlos Alazraqui
Musicians Aaron Daniel Jacob
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