Orrin Keepnews was an American jazz writer and record producer known for founding Riverside Records and Milestone Records, for freelance work, and for his work at other labels.

William John Evans was an American jazz pianist and composer who worked primarily as the leader of his trio. His interpretations of traditional jazz repertoire, his ways of using impressionist harmony and block chords, and his trademark rhythmically independent, "singing" melodic lines, continue to influence jazz pianists today.