Vivian Patrick Campbell is a Northern Irish rock guitarist. He came to prominence in the early 1980s as a member of Dio, and has been a member of Def Leppard since 1992. Campbell has also worked with Thin Lizzy, Whitesnake, Sweet Savage, Trinity, Riverdogs, and Shadow King.
Campbell continued to tour with Def Leppard in summer 2014 as co-headliners with Kiss.
Biography via Wikipedia