Milo Murphy's Law Wiki

Jeffrey K. Marsh also known as Jeff "Swampy" Marsh and Swampy (born December 9, 1960) is an American animator, writer, director, producer, and voice actor associated with several animated television series. He portrays the voice of Major Monogram in the Disney XD cartoons Phineas and Ferb and Milo Murphy's Law, both of which he co-created with Dan Povenmire. In Milo Murphy's Law, he also voices Balthazar Cavendish, Cavenpuss, Armory Security Guard, Lieutenant Tennant, and Mantel.

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.

Previously, he was a director and one of the writers of the '90s nicktoon Rocko's Modern Life and storyboard artist for longest-running Fox cartoon The Simpsons.

Episodes he wrote


  • During his 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.[1]
  • He is the grandson of world-renowned bandleader and songwriter, Les Brown.[1]
  • 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.[2]
  • As for Phineas and Ferb, he appears as himself in Tri-Stone Area, Phineas and Ferb: Star Wars, and Act Your Age.




Milo Murphy's Law

Real World



External links

This page uses Creative Commons Licensed content from Wikipedia (view authors). Smallwikipedialogo.png
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 "Weird 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 Fonda
Jeff BennettCarlos Alazraqui
Musicians Aaron Daniel Jacob