Kirk Windstein (born 14 April 1965, Middlesex, England) is an English-American sludge metal singer and guitarist for the New Orleans bands Crowbar, Down, and Kingdom of Sorrow.He currently plays guitar for Crowbar. He formerly played guitar in Down, resigning in 2013, and he also played bass for Valume Nob, but resigned in 2006, citing he was unable to commit the time needed to give it full justice. In February 2005, Windstein formed Kingdom of Sorrow with Jamey Jasta of Hatebreed.