William Richard Frisell (born March 18, 1951) is an American guitarist, composer and arranger. One of the leading guitarists in jazz since the late 1980s, Frisell came to prominence as a stalwart for ECM Records. He went on to work in a variety of contexts, notably as a member of the New York City Downtown Scene where he formed a long partnership with John Zorn. He was also a longtime member of Paul Motian's groups from the early 1980s until Motian's death in 2011.