Philip Kenneth Collen (born 8 December 1957)[citation needed] is an English musician who is best known as the co-lead guitarist for the rock band Def Leppard, joining the band in 1982 during the recording of the Pyromania album. Prior to joining Def Leppard, Collen had performed with a number of bands in the burgeoning British glam metal scene. Outside of Def Leppard, with which he still records and performs live, he has been involved in a number of side projects most notably the trio Man Raze, with which he is the lead singer and sole guitarist.