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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
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 wikipedia: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 2016. He also voices Balthazar Cavendish.

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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