Matt Mercer did not leave Critical Role as it was rumored by a section of the public.
Matthew Mercer and Critical Role have had a dramatic impact on the D&D community.
Matt Mercer has been involved in Campaigns 1 and 2 of Critical Role as Dungeon Master (DM) for the show. He is also a member of the board of directors for the Critical Role Foundation.
Matt Mercer created the campaign that eventually became Critical Role, he made up his own world of Exandria and restructured some of the game system rules to allow for more flexibility in the storyline.
He has been the Dungeon Master since the beginning of the campaign in 2012.
Matt Mercer is also known for his work with Studiopolis, Viz Media, Bang Zoom! Entertainment, Funimation, and NYAV Post in anime, cartoons, and video games.