Richards, 38, is the executive producer of “Jeopardy!” and “Wheel of Fortune,” but will now also serve as the full-time host of the former, beginning with season 38.
Bialik, widely known for playing neuroscientist Amy Farrah Fowler in “Big Bang Theory,” will host the “Jeopardy!” primetime and spinoff series, including the Jeopardy! National College Championship.
Ken Jennings, one of the show’s most well-known former contestants, will serve as a consulting producer.
Trebek hosted more than 8,200 episodes over the course of nearly 37 seasons before he died in November due to a battle with pancreatic cancer. The popular show cycled through a number of guests hosts in the nine months since before landing on Richards and Bialik.