Stephen Arnold is a bassist and composer from Greenfield, Massachusetts and based in Washington, DC. A pianist from a young age, Arnold picked up the upright bass at the George Washington University, where he studied with Herman Burney, Jr. Shortly after college he was selected to participate in the Betty Carter Jazz Ahead program at the Kennedy Center under the direction of Jason Moran. Arnold contributes to projects by a wide variety of artists including Fran Vielma, Sharón Clark, Todd Marcus, Brandon Woody, and ¡FIASCO! and has performed at many great venues, such as the Library of Congress, the Kennedy Center, Blues Alley, and the Howard Theater.

Arnold's band Sea Change has released two acclaimed albums of original compositions, with the most recent, Until Now, having been voted Capitalbop’s #2 DC Jazz Album of 2023. Sea Change has been featured in venues such as the 2024 DC Jazz Festival, the Smithsonian American Art Museum, the Gaithersburg Arts Barn, the Bop Stop at the Music Settlement, Maryland Hall, and An Die Musik, with a new album currently in the works for 2026.