Before joining "The Big Bang Theory," Galecki builds a career in television, film, and theater, gaining early recognition for his role as David Healy on "Roseanne." His work on the long-running sitcom provides him with experience in a multi-camera format and ensemble storytelling.

Galecki also appears in feature films including "National Lampoon’s Christmas Vacation" and other projects across drama and comedy, working with a range of directors and casts. These roles expand his experience in both film and television prior to his role on the series.

In addition to his screen work, Galecki participates in stage productions, including performances in theater that contribute to his development as an actor across different mediums. His background includes work in both contemporary and classical productions.

Outside of acting, Galecki is involved in environmental and sustainability interests and continues to pursue work in television and film while maintaining a presence in the entertainment industry.