Michael Andrew "Duff" McKagan (born February 5, 1964) is an American musician, singer, songwriter and author. He is best known for his twelve-year tenure as the bassist of the hard rock band Guns N' Roses, with whom he achieved worldwide success in the late 1980s and early 1990s. During his later years with the band, he released a solo album, Believe in Me (1993), and formed the short-lived supergroup Neurotic Outsiders.