Leonard’s father is finally coming to town on The Big Bang Theory!

It was announced at Wednesday’s PaleyFest panel that Judd Hirsch has been tapped to play Leonard’s dad, who is a stark contrast to Leonard’s mom, Dr. Beverly Hofstadter (Christine Baranski).

“We talked about Leonard’s father being a very different kind of character than his mother,” executive producer Chuck Lorre told EW ahead of the panel. “When you look at Leonard and his mother, and how different Leonard is, well the other piece of the equation is his dad, so you can imagine the space that character has to occupy and who he’d have to be to get a Leonard out of the equation.”