- Irwin has appeared in number of shows, such as: My So-Called Life, Without A Trace, ER, Saving Grace, Angel and My Life and Times.
- Along with actors Jeff Perry, Gary Sinise, Laurie Metcalfe, John Malkovich, Joan Allen he founded the Steppenwolf Theatre after college.
- He appered in a 1990 Broadway production of Grapes of Wrath.
- Irwin graduated from Illinois State University in Normal, Illinois and currently lives in Los Angeles, California.
Community content is available under CC BY-NC-ND unless otherwise noted.