http://blog.steppenwolf.org/
Originally founded by actors from Illinois State University who began the theater in the basement of a north suburban church, the company's star-studded ensemble now numbers some famous film and stage presences--John Malkovich, Gary Sinise, Joan Allen, Laurie Metcalf and John Mahoney. Few of them perform regularly with the ensemble anymore, but most return occasionally to perform in a mainstage offering. William Peterson of CSI, has recently joined the cast.
see also The Theatre Scene in Chicago
http://www.theatreinchicago.com/