Jason Curtis Newsted (born March 4, 1963) is an American musician who was the bassist of American heavy metal band Metallica from 1986 to 2001. Beginning his career with thrash metal band Flotsam and Jetsam from 1981 to 1986, he successfully auditioned with Metallica to succeed the deceased Cliff Burton. Newsted performed on the albums ...And Justice for All (1988), Metallica (1991), Load (1996), and Reload (1997), the most album appearances among Metallica's bassists.
After leaving Metallica, Newsted was a member of metal bands Echobrain and Voivod and toured with Ozzy Osbourne, using the pseudonym Jasonic for Voivod. He also fronted heavy metal band Newsted from 2012 to 2014. Newsted was inducted to the Rock and Roll Hall of Fame as a member of Metallica in 2009.