[1] His recordings with the band include the first EP "1945", Single ("Playpen"), BYO Compilation song "(Mass Hysteria)", and first full-length album Mommy's Little Monster.
In 1992 Brian Grillo (ex-singer of Lockup) enlisted O'Brien to play with Extra Fancy, including guitarist Michael Hately and bassist David Foster.
1996 - 2015, O'Brien and other founding members Greg Hetson (Bad Religion, Circle Jerks) and Eric Melvin (NOFX) formed Punk Rock Karaoke.
Another female fronted band during this time was Drag Beat featuring Rick Ballard and PJ Wolfe (founders of Acetate Records).
In 2009 he relocated the studio to Santa Fe Springs, California and now offers recording, mixing, mastering, rehearsals, a course in audio engineering and private drum lessons.