William Reed Mullin (born February 12, 1966) is the American drummer for metal band Corrosion of Conformity (COC). He was the founding member with Mike Dean and Woody Weatherman. Mullin, along with Weatherman, also played in the Raleigh NC hardcore band, No Labels. No Labels disbanded in 1984, while Corrosion of Conformity continued to evolve and gain popularity. He left COC on February 1, 2001 due to back injury.