Michael Andrew "Duff" McKagan (born February 5, 1964), is an American musician who is best known for his thirteen-year tenure in the hard rock band Guns N' Roses. He is currently the bassist for both Velvet Revolver and Jane's Addiction while he is also the lead vocalist and guitarist for his own solo punk rock project Duff McKagan's Loaded, and a weekly columnist for SeattleWeekly.com. He also writes a weekly financial column for Playboy.com called Duffonomics.