Steve Molaro will segue to spinoff 'Young Sheldon,' though he and Chuck Lorre will remain highly involved on the flagship.

There's a change in the executive ranks of TV's No. 1 comedy.

Executive producer Steve Holland has been promoted to serve as showrunner of CBS' The Big Bang Theory. He will take over the role from Steve Molaro, who will segue to overseeing spinoff Young Sheldon. Molaro and creator Chuck Lorre will continue to oversee Big Bang Theory, with Holland now running the show's writers room starting with the upcoming 11th season. Holland will work closely with both Lorre and Molaro on the series.

Molaro, who had been running Big Bang Theory since season six, helped develop Young Sheldon and will be running the room for the upcoming 1980s-set comedy starring Iain Armitage and narrated by Jim Parsons. With Molaro focused on Young Sheldon, an insider was needed to run the room at the flagship series.

Holland has been with Big Bang Theory since season three and was promoted to executive producer in season 10. He is now the third showrunner on the series and follows Molaro and co-creator Bill Prady.

Big Bang Theory is TV's No. 1 comedy in the advertiser-coveted adults 18-49 demographic and has been renewed for two additional seasons (44 episodes total) for what is considered to be its final run.

Holland, a regular staple on Big Bang Theory's Comic-Con panels, counts Rules of Engagement and Zoey 101 among his credits. He is repped by WME.

Big Bang Theory returns Monday, Sept. 25, at 8 p.m. ET/PT on CBS.