Kirk Windstein is an American musician. He is a founding member of the sludge metal band Crowbar, and formerly played with the heavy metal band Down from 1991 to 2013. In 2005, Windstein formed Kingdom of Sorrow with Jamey Jasta of Hatebreed. Their debut album was released in 2008. Windstein began his musical career in 1985 as a guitarist for a cover band called Victorian Blitz, and in 1988 joined a hardcore punk band called Shell Shock as a vocalist and guitarist.