- Met his future wife, Jean Smart, when he guest-starred on her show, Designing Women (1986). Delta Burke arranged for the two to meet.
- 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.".
- Was born on the same day as Richard Dean Anderson.
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