He embarked on an acting career after attending Michigan State University, where he majored in music.
After small roles in several studio feature films, including Starship Troopers (1997) and Best in Show (2000), Christopher was cast in the lead in Dumped (2000).
Showerman has appeared in such films as Sea of Fear, Idol, Live Fast, Die Young, Complacent, and Big Game.
His film credits include Hole in One, A Night at the Silent Movie Theater, Commander and Chief, and Radio America, which he also wrote, produced and directed.
The company also produced Radio America, co-starring, directed and written by Showerman.