Phil Demmel is an American musician who played lead guitar in the heavy metal band Machine Head between 2002 and 2018, making him their longest running member in that position. He has also performed with other artists such as Vio-lence, Torque, Metal Allegiance, BPMD, Kerry King and Category 7, and briefly with Slayer, Nonpoint, Overkill, Lamb of God and Testament as a fill-in guitarist.