Prior to joining Primus last August, Brain was the drummer for the Limbomaniacs, which once featured Mark "M.I.R.V." Haggard. Brain also worked with MIRV on 1993's Cosmodrome -which was produced by Les Claypool- and a did a little drumming on the band's latest release, Feeding Time on Monkey Island.
Brain also used to drum for the Bill Laswell sideproject Praxis, whose members included Buckethead, Bernie Worell, and "Bootsy" Collins on Bass. Last year, Brain, Buckethead, and former Limbomaniacs guitarist Pete S. got together for a sideproject called Giant Robot, and Brain played drums for Godflesh on the summer '96 tour in addition to doing some work on their latest album. Brain has also worked with Tom Waits, Jon Hassell, and once did a little ditty with Les and Joe Gore (P.J. Harvey) called GoreLesBrain.