American jazz pianist and composer James P. Johnson (1894-1955) was a pivotal figure in the development of stride piano and a key transitional figure between ragtime and jazz. His innovative piano style and prolific compositions, including "Carolina Shout" and the popular "Charleston," profoundly influenced generations of jazz musicians and helped define the sound of the 1920s. Johnson's contributions extended beyond piano, with his orchestral works and Broadway scores showcasing his versatility and enduring impact on American music.