Biography
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 Disney's animated series Phineas and Ferb and Milo Murphy's Law, both of which he co-created with Dan Povenmire. Marsh was born in Santa Monica, California, where he grew up with a heavily blended family dynamic. Marsh has been and continues to be a driving for...
Known For
Complete Filmography
Spiked
2025
as (voice)
Holly is a young, courageous hedgehog, but woefully sheltered by her overprotective Dad. Walter is an overworked, exhausted rabbit with a few dozen ki...
Phineas and Ferb the Movie: Candace Against the Universe
2020
as Major Monogram (voice)
Phineas and Ferb travel across the galaxy to rescue their older sister Candace, who has been abducted by aliens and taken to a utopia in a far-off pla...
Phineas and Ferb the Movie: Candace Against the Universe
2020
Characters, Executive Producer, Writer
Phineas and Ferb travel across the galaxy to rescue their older sister Candace, who has been abducted by aliens and taken to a utopia in a far-off pla...
TV's Funniest Animated Stars: A Paley Center for Media Special
2015
as Self
The top 40 funniest cartoon characters are showcased in this TV special, as determined by a Nielsen viewers' survey.
O.W.C.A. Files
2015
as Major Monogram / Additional Voices (voice)
When an attack on the O.W.C.A. incapacitates the animal agents, only Agent P and his animal trainees can save the day. Carl and Monogram fend for them...
O.W.C.A. Files
2015
Executive Producer
When an attack on the O.W.C.A. incapacitates the animal agents, only Agent P and his animal trainees can save the day. Carl and Monogram fend for them...
Phineas and Ferb: Last Day of Summer
2015
as Major Monogram (voice)
On the inevitable 104th day of summer vacation, the season — and the series — is quickly coming to an end, and it’s Candace’s last chance to bust her ...
Phineas and Ferb: Night of the Living Pharmacists
2014
as Major Francis Monogram (voice)
Doofenshmirtz's latest "-inator" accidentally turns the citizens of Danville into contagious mindless repulsive pharmacists that look like him who run...
Phineas and Ferb: Night of the Living Pharmacists
2014
Creator
Doofenshmirtz's latest "-inator" accidentally turns the citizens of Danville into contagious mindless repulsive pharmacists that look like him who run...
Phineas and Ferb: Star Wars
2014
as Major Hologram / Imperial Officer Jeff / Additional Voices
Phineas and Ferb become the galaxy's unlikeliest last hope when they must return the Death Star plans to the Rebel Alliance.
Phineas and Ferb: Star Wars
2014
Creator, Characters
Phineas and Ferb become the galaxy's unlikeliest last hope when they must return the Death Star plans to the Rebel Alliance.
Phineas and Ferb Save Summer
2014
as Major Francis Monogram / Additional Voices (voice)
When L.O.V.E.M.U.F.F.I.N. moves the Earth further from the sun, Phineas and Ferb must find a way to save summer and prevent a new ice age.
Phineas and Ferb Save Summer
2014
Creator
When L.O.V.E.M.U.F.F.I.N. moves the Earth further from the sun, Phineas and Ferb must find a way to save summer and prevent a new ice age.
I Know That Voice
2014
as Self
Filmmaker Lawrence Shapiro discusses voice-over acting with the talented people behind the characters.
Phineas and Ferb: Mission Marvel
2013
as Francis Major Monogram / Gordon Gutsofanemu / Additional Voices
Phineas and Ferb team up with the Avengers to save the world from Dr. Doofenshmirtz and a group of dangerous supervillains.
Phineas and Ferb: Mission Marvel
2013
Characters
Phineas and Ferb team up with the Avengers to save the world from Dr. Doofenshmirtz and a group of dangerous supervillains.
Phineas and Ferb: The Perry Files - Animal Agents
2013
as Major Monogram (voice)
Perry the Platypus - a.k.a. Agent P - and his fellow operatives team up to thwart Dr. Doofenshmirtz and his dastardly "Inators." Be they furry or feat...
Phineas and Ferb: The Daze of Summer
2012
Super-smart and seriously funny stepbrothers Phineas and Ferb come up with unusually exciting ways to spend the lazy, crazy "daze" of summer -- like s...
Phineas and Ferb: The Daze of Summer
2012
Writer
Super-smart and seriously funny stepbrothers Phineas and Ferb come up with unusually exciting ways to spend the lazy, crazy "daze" of summer -- like s...
Phineas and Ferb The Movie: Across the 2nd Dimension
2011
as Major Francis Monogram / Monogram-2 (voice)
Phineas and Ferb get trapped in an alternate dimension where the evil Doofenshmirtz rules the tri-state area. They must find a way back home with the ...
Phineas and Ferb The Movie: Across the 2nd Dimension
2011
Sequence Supervisor, Executive Producer, Writer
Phineas and Ferb get trapped in an alternate dimension where the evil Doofenshmirtz rules the tri-state area. They must find a way back home with the ...
Phineas and Ferb: Summer Belongs to You!
2010
as Major Francis Monogram (voice) / Additional Voices
It's the summer solstice, so Phineas, Ferb, and their friends decide to travel around the world in one day in an effort to create the "biggest, longes...
Phineas and Ferb: Summer Belongs to You!
2010
Story, Additional Writing
It's the summer solstice, so Phineas, Ferb, and their friends decide to travel around the world in one day in an effort to create the "biggest, longes...
Phineas and Ferb Christmas Vacation!
2009
as Major Monogram (voice)
Phineas and Ferb turn the city of Danville into a giant thank you card for Santa Claus because they feel nobody ever thanks him for all the joy he bri...
Phineas and Ferb Christmas Vacation!
2009
Producer
Phineas and Ferb turn the city of Danville into a giant thank you card for Santa Claus because they feel nobody ever thanks him for all the joy he bri...
Looks Can Kill
1994
Associate Producer
A stripper takes vengeance on her audience.