Mike Tempesta is a rock guitarist and an artist relations manager. He also goes by the moniker "M.33". He was credited for rhythm guitar on the 1990 Anthrax album Persistence of Time. Before his career as a musician, he was a guitar technician for Anthrax's Scott Ian. He was a member of Human Waste Project, and played rhythm guitar in the band Powerman 5000 until his departure in 2005.