He has a brother who writes and performs music under the stage name Dave Heatwave.

He attended Agoura High School in Agoura Hills, California. His family moved to Los Angeles when he was young. Mercer was born Matthew Christopher Miller in Palm Beach Gardens, Florida, on Jto 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, Kurtis Stryker in Mortal Kombat 9, Chrom and Ryoma in Fire Emblem, Jack Cooper in Titanfall 2, Espio in Sonic the Hedgehog, Cole Cassidy in Overwatch, Yusuke Kitagawa in Persona 5, MacCready in Fallout 4, Midas and Syd in Fortnite, Edér Teylecg in Pillars of Eternity, Gangplank and Kindred's Wolf in League of Legends, Walter in Shin Megami Tensei IV, and Calamity Ganon worshipper in Hyrule Warriors: Age of Calamity. In anime, Mercer voices Kagaya Ubuyashiki in Demon Slayer: Kimetsu no Yaiba, 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, and Leorio in Hunter x Hunter. He is best known for his work with Studiopolis, Viz Media, Bang Zoom! Entertainment, Funimation, and NYAV Post in anime, cartoons, and video games.

Matthew Christopher Miller (born June 29, 1982), better known as Matthew Mercer, is an American voice actor.

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