On Broadway, Campbell was Lvov in the production of "Ivanov" with Kevin Kline, and Manus in Howard Davies' production of "Translations" with Brian Dennehy. At The Public Theater in New York City, he performed in such productions as "King Lear," "As You Like It," "The Treatment," "Him," and "In The Blood" -- written by and starring Christopher Walken -- Campbell starred as his twin bother. Other theatre productions include the Manhattan Theatre Club production of "Mad Forest," the Classic Stage production of "The Illusion," and the Steppenwolf Theatre production of "Mojo." Campbell graduated from the Yale School of Drama and has performed in numerous Yale Repertory Theatre productions.