He attended Agoura High School in Agoura Hills, California. His family moved to Los Angeles when he was eight. Mercer was born Matthew Christopher Miller in Palm Beach Gardens, Florida, to a family of Scottish descent. He is also a game designer and the chief creative officer of Critical Role Productions. In addition to his voice acting work, Mercer has developed and served as the Dungeon Master for the Dungeons & Dragons web series Critical Role since 2015.

Kennedy in Resident Evil 6, Ganondorf in The Legend of Zelda: Tears of the Kingdom, Kurtis Stryker in Mortal Kombat 9, Chrom and Ryoma in Fire Emblem, Jack Cooper in Titanfall 2, Espio the Chameleon in Sonic the Hedgehog, Deadshot in Injustice 2, Cole Cassidy (formerly Jesse McCree) in Overwatch, Yusuke Kitagawa in Persona 5, MacCready in Fallout 4, Midas and Syd in Fortnite: Battle Royale and Fortnite: Save the World respectively, Edér Teylecg and Aloth Corfiser in Pillars of Eternity, Gangplank and Kindred's Wolf in League of Legends, Walter in Shin Megami Tensei IV, Ira from Kingdom Hearts and Goro Majima from Yakuza: Like a Dragon.

In anime, Mercer voices Levi Ackerman in Attack on Titan, Kiritsugu Emiya in Fate/Zero, Jotaro Kujo in JoJo's Bizarre Adventure, Aikurō Mikisugi in Kill la Kill, Kanji Tatsumi during the second half of Persona 4: The Animation, the second voice of Yamato and Pain in Naruto, Trafalgar Law in the Funimation dub of One Piece, Hit in Dragon Ball Super, Seijirou Kikuoka in Sword Art Online, Falco in Cyberpunk: Edgerunners, and Leorio in Hunter x Hunter.

Matthew Christopher Miller, better known as Matthew Mercer, is an American voice actor working for Studiopolis, Funimation, Bang Zoom! Entertainment, Viz Media, and NYAV Post in anime, cartoons, and video games.

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