Peter Andrew Willis (born 16 February 1960) is a retired English musician and songwriter. He is best known as a founding member of the band Def Leppard. He co-wrote many tracks and played guitar on the band's first three albums: "On Through the Night", "High 'n' Dry", and "Pyromania". He was fired from Def Leppard in 1982 and replaced by Phil Collen. 