who plays leonards dad on big bang theory
Judd Hirsch In 2016 Hirsch appeared on the CBS comedy series The Big Bang Theory portraying Leonard's (Johnny Galecki) father.
List of The Big Bang Theory characters Over time, several supporting characters have been introduced and promoted to starring roles, including Leslie Winkle, Amy Farrah Fowler, Bernadette Rostenkowski-Wolowitz, Stuart Bloom, and Emily Sweeney. The series also features numerous supporting characters, each of whom plays a prominent role in a small group of episodes. Included among them are parents of the main characters, their dates and their coworkers. Celebrities such as Stephen Hawking occasionally appear in cameo roles as themselves.