Jeff 'Swampy' Marsh was born on December 9, 1960 in Santa Monica, California, USA. He is an actor and writer, known for Phineas and Ferb (2007), Phineas and Ferb the Movie: Across the 2nd Dimension (2011) and Rocko's Modern Life (1993). He has been married to Birgitte since December 17, 2006. They have two children.