Vivian Patrick Campbell (born 25 August 1962) is a Northern Irish singer-songwriter and musician. He came to prominence in the early 1980s as a member of Dio, and has been a member of Def Leppard since 1992 (replacing Steve Clark after his death). Campbell has also worked with Thin Lizzy, Whitesnake, Sweet Savage, Trinity, Riverdogs, and Shadow King.