Colin Cunningham (born December 29, 1986),[2] known professionally as Colin "Doc" Brittain, is an American songwriter, producer, and musician signed to Warner Chappell Music.

Prior to joining Linkin Park, he wrote and produced for acts such as Papa Roach, 311, A Day to Remember, Foundry, Dashboard Confessional, 5 Seconds of Summer, From Ashes to New, and One Ok Rock.

[5] Brittain began his career playing drums in the band Oh No Fiasco.

[6] Oh No Fiasco was signed to Five Seven Music where they released their debut EP, No One's Gotta Know.

In 2024, he joined American rock band Linkin Park as their new drummer, after original drummer Rob Bourdon declined to rejoin the reunited band.