Jeff "Swampy" Marsh

Jeffrey Kent "Swampy" Marsh is an American animator, voice actor, writer, director, and producer. With Dan Povenmire, Marsh is the co-creator and co-star of the Disney Channel animated series Phineas and Ferb and Milo Murphy's Law. Marsh was born in Santa Monica, California, where he grew up with a heavily blended family dynamic. Marsh is known for his contributions to the television animation industry, working for over six seasons on the animated television series The Simpsons. Marsh continued to work on other animated television series, including King of the Hill and Rocko's Modern Life, before moving to England in 1996.