Galecki was an established actor when he appeared during the fourth season of Roseanne as David Healy. His biggest role to ...

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).

is the eldest child of Darlene Conner and David Healy, and when Roseanne became The Conners, Shameless actress Kenney became a series regular, a position that she’s held to this day.