Travis Willingham is an actor and VA who has loaned his voice to some incredible roles over the years. Chances are you’ve heard his voice, whether you realise it or not.
Matthew Mercer has become one of the big TTRPG Dungeon Masters. He’s run games for Vin Diesel, Stephen Colbert and other celebrities such as Terry Crews through the CelebriD&D series.
Critical Role is most likely where you know Laura Bailey from. Unless, of course, you enjoy reading video game and anime credits.
Liam O’Brien could appear (sort of) in a variety of places. When you really look into it though, he is everywhere, he is behind an entire army of voices.