Both Warren and Willis joined the Melvins in January 2006 and appear on (A) Senile Animal as well as 2008's Nude with Boots and 2010's album The Bride Screamed Murder. Warren was previously a member of bands Karp, Tight Bros from Way Back When,[3]White Shit, and The Whip.[4] He also contributed vocals to the song "Breaking Rocks" on the album Forging Steel and Laying Stone by Akimbo.
In September 2022, Sara Lund from Unwound revealed in an interview with Pitchfork that Warren was recruited to play bass on the band's reunion tour, replacing late bassist Vern Rumsey.[5]