William Robert “Bill” Dixon (October 5, 1925 – June 16, 2010) was an American composer, improviser, visual artist, activist, and educator. Dixon was one of the seminal figures in free jazz and late twentieth-century contemporary music. His was also a prominent voice arguing for artist's rights and insisting, through words and deeds, on the cultural and aesthetic richness of the African American music tradition. He played the trumpet, flugelhorn, and piano, often using electronic delay and reverb.