Jeff 'Swampy' Marsh
Actor · Executive Producer · Story · Additional Writing
Born Dec 9, 1960 · Santa Monica, California, USA
Active 1993–present
Jeff "Swampy" Marsh (born December 9, 1960) is an American animator, writer, director, producer, and voice actor associated with several animated television series, most notably as an executive producer and the voice of Major Monogram for…
Filmography
Agent P Under C (2026) — Major Monogram (voice)Cartoonified! With Phineas and Ferb (2025) — CreatorHey A.J.! (2026) — Executive ProducerSpiked (2025) — Big Boss Croc / Exterminator (voice)Untitled Phineas and Ferb Movie — Major Francis Monogram (voice) · Writer · Executive ProducerPhineas and Ferb (2007) — Francis Monogram (voice) · Writer · Director · Executive Producer · Story · CreatorPhineas and Ferb The Movie: Across the 2nd Dimension (2011) — Major Francis Monogram / Monogram-2 (voice) · Sequence Supervisor · Executive Producer · WriterPhineas and Ferb the Movie: Candace Against the Universe (2020) — Major Monogram (voice) · Executive Producer · WriterRocko's Modern Life (1993) — Storyboard Artist · Additional Writing · DirectorPhineas and Ferb: Star Wars (2014) — Major Hologram / Imperial Officer Jeff / Additional VoicesPhineas and Ferb: Mission Marvel (2013) — Francis Major Monogram / Gordon Gutsofanemu / Additional VoicesMilo Murphy's Law (2016) — Additional Voices (voice) · Executive Producer · Story · CreatorPhineas and Ferb: Summer Belongs to You! (2010) — Major Francis Monogram / Additional Voices (voice) · Story · Additional WritingPhineas and Ferb: Last Day of Summer (2015) — Major Monogram (voice)Take Two with Phineas and Ferb (2010) — Executive Producer · CreatorPhineas and Ferb Christmas Vacation! (2009) — Major Monogram (voice) · ProducerPhineas and Ferb: The Perry Files - Animal Agents (2013) — Major Monogram (voice)Pete the Cat (2017) — Writer · CreatorPhineas and Ferb: Night of the Living Pharmacists (2014) — Major Francis Monogram (voice)O.W.C.A. Files (2015) — Major Monogram / Additional Voices (voice) · Executive ProducerPhineas and Ferb: The Daze of Summer (2012) — WriterPhineas and Ferb Save Summer (2014) — Major Francis Monogram / Additional Voices (voice)Aaagh! It's the Mr. Hell Show! (2001) — Josh (voice)Looks Can Kill (1994) — Associate Producer