John Kiffmeyer (born July 11, 1969), known professionally in music as Al Sobrante, is an American musician, best known as a former drummer for the punk rock band Green Day. His name of Al Sobrante is a reference to his hometown, El Sobrante. His work with Green Day resulted in about 961,000 albums sold, which are mostly from the compilation album 1,039/Smoothed Out Slappy Hours.