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).

Simon Helberg found Kaley Cuoco and Johnny Galecki's relationship amusing, as he had suspected it all along. Helberg was ...