Mark Kasprzyk (born 1977), stage name M. Rivers, previously known by the stage name Kazzer, is a Canadian musician whose work has ranged from rap rock to alternative rock. He is the lead vocalist and lyricist of the rock band Redlight King, best known for their song "Bullet in My Hand", which was aired regularly on MuchMusic and MTV Europe, played on contemporary hit radio, hot adult contemporary, alternative rock and mainstream rock radio stations in Canada. He is also an auto sports television personality.