Born in Belgium where his father was stationed while serving in the US Air Force. He moved to Chicago when he was 3 years old.
In 1991, he starred in the made-for-TV movie Backfield in Motion (1991) (TV), which co-starred the production team of Roseanne and Tom Arnold. The next year, Galecki joined the cast of "Roseanne" (1988) as Darlene's sensitive and put-upon boyfriend, David.
At the age of 11, he received a Joseph Jefferson citation nomination for his critically-acclaimed performance as John Henry in The Member of the Wedding.
By age 7, he began performing in such prestigious theater productions as "Fiddler on the Roof", "Pippin" and "Galileo", opposite Brian Dennehy at The Goodman Theater in Chicago.
Star/producer/writer Roseanne of "Roseanne" (1988) praises Galecki's "great vulnerability".
Brother of Nick Galecki.
Close friend of Sara Gilbert.
"I don't know what to do with myself between films. I end up doing unhealthy things like shopping or drinking. I'm pretty schizophrenic about it."
(On appearing in Don Roos's edgy dark comedy The Opposite of Sex (1998)): "I wanted to do a bigger movie with a broader audience. I realized there are people between the coasts that have no idea I've worked since "Roseanne" (1988).
"Right now, I'm very healthy. I have no vices left. Except sugary breakfast cereal. And absinthe, of course."
(On co-starring in NBC's A Family Torn Apart (1993) (TV) which co-stars Neil Patrick Harris): "I wanted to do something a little diverse from that people were used to seeing me do. I'm just a big fan of true-life crime stories. I'm not a violent person".
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