Judd Hirsch’s impressive acting career stretches all the way back to the early 1970s! He started with a couple of tiny, uncredited roles and steadily climbed the ranks until getting his most memorable role as Alex Reiger in the TV show “Taxi,” which ran for more than 100 episodes.
TBBT was a drop in the bucket of acting credits this actor has under his belt. After the show ended, he never went off screen and kept appearing regularly n a multitude of TV productions, and has even lent his voice to the Netflix hit adult cartoon “Big Mouth.”
Brian Posehn as Bert Kibbler — Now
While mostly appearing in minor roles, Brian Posehn has loads of acting credits to his name. He first started acting in various small roles in the mid-90s and has been in the industry ever since. He's done film, TV, voice acting and has even produced and written for television.
Among his latest roles, you can find a recurring role in the TV show "Top Secret Videos" and the voice role of Sour Cream in the sophisticated cartoon, "Steven Universe."
Judd Hirsch as Alfred Hofstadter — Then
Although mentioned many times over the course of the show, Alfred Hofstadter, Leonard's father, appears in the flesh for no more than two episodes. Before that, all the things the viewers knew about him were bits of information told by Leonard's mother, Beverly, which didn't paint him in a very flattering light.
However, the two eventually get divorced, which benefits them both. In fact, at the end of season 9, he meets Mary, Sheldon's mother, and the two seem to have good chemistry, which leads to a prospect of an interesting relationship.
Regina King as Janine Davis — Then
In a show where most characters are awkward and socially inept, it's nice to occasionally be reminded of a normal person's perspective. Janine Davis is another Caltech employee, but she isn't a scientist. She works at the university's HR department, which makes her one of the very few sane voices on the show.
Whenever one of the main gang's men unknowingly does something inappropriate, you can trust Janine to lay down the law and explain some basic human etiquette. We very much appreciate her service.
Regina King as Janine Davis — Now
With a name so regal, you can't help but bow down to Regina King. Her acting career started with a bang when she landed the role of Brenda Jenkin in "227" — a role she stuck with for 5 years and 110 episodes. Not bad for a first gig!
Since then, this talented actress has been a series regular in more shows than we can count. ("24," "Southland," and "American Crime," just to name a few.) After TBBT was over, King went on to star a Sister Night (aka Angela Abar) in the hit superhero ministries, "Watchmen."