Jon Ivar Christensen was a Norwegian jazz drummer. He was married to actress, minister, and theater director Ellen Horn, and was the father of singer and actress Emilie Stoesen Christensen.

George Allen Russell was an American jazz pianist, composer, arranger and theorist. He is considered one of the first jazz musicians to contribute to general music theory with a theory of harmony based on jazz rather than European music, in his book Lydian Chromatic Concept of Tonal Organization (1953).