The Big Bang Theory was one of CBS's most popular sitcoms on television. For 12 seasons, fans got to know Sheldon Cooper up ...

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).

Alaina Meyer and Johnny Galecki (2019) Joe Scarnici / Contributor In 2018, it was confirmed that the 43-year-old actor was dating 21-year-old model Alaina Meyer.