Jason Curtis Newsted (born March 4, 1963 in Battle Creek, Michigan) is an American bassist known for his work with Metallica, Voivod and Flotsam and Jetsam. Joining the band in 1986 after Cliff Burton’s death, Newsted remained a member until 2001, making him Metallica’s longest-serving bassist. After he left Metallica, he continued with his project Echobrain, played with Ozzy Osbourne and joined heavy metal band Voivod. Newsted uses the pseudonym Jasonic, which serves as both his alias in Voivod and the name of his music publishing company. He is also the founder of the Chophouse Records studio and label based in California.