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 ...
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).