Christopher Castile

Christopher Jon Castile is an American former actor. His well-known roles include Ted Newton in Beethoven and Beethoven's 2nd, the voice of Zachary Sellers and Nick Mulligan in Focus on the Family's Adventures in Odyssey, Mark Foster on the sitcom Step by Step, and the voice of Eugene Horowitz in Hey Arnold! Castile retired from acting following the cancellation of Step By Step. He received a master's degree, he currently teaches political science as a professor at Biola University in La Mirada, California, and is teaching at Downey High School as a U.S. History teacher. His class is called Step By Step.