Father, with Jean Smart, of Connor Douglas Gilliland (b. 25 October 1989) and Forrest (b. July 2008, adopted May 2009).
Attended the Goodman School of Drama in Chicago.
Gilliland had a career on stage in Los Angeles, Chicago and off-Broadway in New York, appearing in productions such as "Amadeus," "Cops," "Beyond Therapy" and "Little Egypt.".