Jeffrey K. Marsh also known as  Jeff "Swampy" Marsh and Swampy (born December 9, 1960) was a director and one of the writers of the program Nickelodeon . Co-creator of Rocko's Modern Life with Phineas and Ferb Dan Povenmire, he has directed, written, and acted in this hit and Disney Channel original series. In Disney XD Phineas and Ferb, he portrays the voice of Major Monogram, the 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.
Phineas and Ferb ended production, Dan and Swampy went on to create premiering on Milo Murphy's Law 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.
 He is the grandson of world-renown band leader and songwriter Les Brown.
 Currently married; wife of Dutch descent, which explains why has so many references to the Netherlands, such as Phineas and Ferb Buford Van Stomm's last name, Florraine from only speaking Dutch, and Imperfect Storm Paolo Vanderbeek being part-Dutch.
 As for Phineas and Ferb, he appears as himself in , Tri-Stone Area , and Phineas and Ferb: Star Wars .
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