Johnny Galecki is an American actor. He rose to fame as David Healy on ABC's Roseanne (1992-1997). Galecki reprised the role on the Roseanne revival (2018) and its spinoff The Conners (2018-2019).
Johnny Galecki, counts Rusty in "Christmas Vacation" as one of his earliest roles. Read more: The 113 Best Comedy Movies Ever "Christmas Vacation" was indeed one of Galecki's first jobs in the ...