Jason Curtis Newsted (born March 4, 1963) is an American metal musician, known for playing bass guitar with the bands Metallica (in which he did occasional lead vocals), Voivod and Flotsam and Jetsam. Joining Metallica in 1986 after Cliff Burton's death, Newsted remained a member until 2001, making him the band's longest-serving bassist. After he left Metallica, he continued with his project Echobrain, played with Ozzy Osbourne and joined heavy metal band Voivod.