Donald Johnson Ellis (July 25, 1934 – December 17, 1978) was an American jazz trumpeter, drummer, composer, and bandleader. He is best known for his extensive musical experimentation, particularly in the area of time signatures. Later in his life he worked as a film composer, contributing a score to 1971's The French Connection and 1973's The Seven-Ups. Ellis was born in Los Angeles, California, on July 25, 1934. His father was a Methodist minister and his mother a church organist.