Stephen Arnold is a bassist, composer, producer, and arranger based in Washington, DC. Originally hailing from Greenfield, Massachusetts, Arnold studied the upright bass with Herman Burney Jr. at the George Washington University, where he majored in Music and English. Since then he has gone on to play both upright and electric bass with many great artists including Todd Marcus, Fran Vielma, Sarah Marie Hughes, José André, Brian Settles, Sharón Clark, Thad Wilson, Dana Hawkins, Jared Sims, Simone Baron, Donvonte’ McCoy, Abe Mamet, Alfred Yun, Alex Hamburger, and Elijah Jamal Balbed and was a member of the 2018 class of Betty Carter's Jazz Ahead program at the Kennedy Center. Arnold's 2020 debut album Sea Change with his band of the same name was a finalist for jazz album of the year at the WAMMIE Awards and voted the #4 DC Jazz album of the year by Capitalbop. He is a member of acclaimed punk-jazz band ¡FIASCO! as well as a free-jazz trio with Sarah Marie Hughes and Kelton Norris, who released their debut recording Still Life in 2021.

Stephen Arnold & Sea Change are due to release their second album Until Now in October 2023. The album features a nine song suite of original compositions by Stephen Arnold and performances by some of DC's best: Sarah Marie Hughes on saxophones, Federico Gonzalez Peña on piano, Nelson Dougherty on guitar, Keith Butler, Jr. on drums, and Arnold on bass.