John Moyer (born November 30, 1973) is an American musician, best known as the current bassist and back-up vocalist for the heavy metal band Disturbed. Taking over in 2004 after Steve "Fuzz" Kmak was fired, Moyer has played bass-guitar with the group since their third studio album, Ten Thousand Fists. Moyer was also the bassist for the American supergroup Adrenaline Mob, joining in February 2012, and remained with the band until August 2014. He currently plays in Art of Anarchy, and in 2015 he became a full time member of the band Operation: Mindcrime.