Bobby Hambel up to now is considered as a "Biohazard mystery". Noone knows exactly why he has left the band but everyone knows that it was big loss for the band. You can hear his cool riffs on three LP's: Biohazard, Urban Discipline, State Of The World Address. After he'd parted ways with Biohazard he has been playing in bands like: White Devil and Cro-Mags for a short time.