Daniel James Irving (born April 16, 1969), better known as Dan Druff, is a bass guitarist, guitar technician, and vocalist who has worked with artists including Queens of the Stone Age, Slayer, Butt Trumpet, The Distillers, Monster Magnet and Sum 41. To date he has worked on over 50 studio records. He has been on tour with Guns N' Roses on the Chinese Democracy Tour.