Mullin was a co-founding member of the band Corrosion of Conformity with Mike Dean and Woody Weatherman[citation needed]. In their earlier years, the band played hardcore punk, but transitioned in the direction of heavy metal with 1991's Blind, playing a style that incorporates elements of southern metal, sludge metal, and stoner metal.[citation needed] Mullin, along with Weatherman, also played in the Raleigh-based hardcore band No Labels. No Labels disbanded in 1984, while Corrosion of Conformity continued to evolve and gain popularity.[2][3]
Mullin left Corrosion of Conformity on February 1, 2001, due to a back injury[citation needed]. Following his departure from Corrosion of Conformity, Mullin worked on several other projects, including as the frontman for power pop band Brown and drummer for hardcore band Man Will Destroy Himself.[4][5] In 2010, Mullin would rejoin Corrosion of Conformity on drums, marking the reformation of the band's lineup from the Animosity era.[6]
On January 27, 2020, Mullin died at the age of 53. He had often missed shows in the four years prior to his death due to a variety of health issues, including an alcohol-related seizure he suffered in June 2016.[8]