Phil Collen is a British musician and songwriter, best known as the lead guitarist for the rock band Def Leppard. He joined the band in 1982 and has contributed to their signature sound, characterized by melodic guitar riffs and harmonies. Collen has also been involved in various side projects and collaborations throughout his career. In addition to his work with Def Leppard, Collen is known for his impressive guitar skills and has been recognized for his contributions to rock music. He has released solo albums and has worked with other artists, showcasing his versatility as a musician.