Ian Ernest Gilmore Evans (né Green; May 13, 1912 – March 20, 1988) was a Canadian–American jazz pianist, arranger, composer and bandleader. He is widely recognized as one of the greatest orchestrators in jazz, playing an important role in the development of cool jazz, modal jazz, free jazz, and jazz fusion. He is best known for his acclaimed collaborations with Miles Davis.
Evans became interested in music at an early age, listening to Duke Ellington, Louis Armstrong, and Fletcher Henderson on the radio and on records. He studied the piano and began learning how to arrange music, and started picking up jobs with local musicians. While in college, he founded his first band, which performed his arrangements, and which became the house band at the Rendezvous Ballroom in Balboa Beach, California, in 1935. The band toured the Pacific Northwest in 1937 and eventually settled in Hollywood, where they regularly performed on Bob Hope's radio show. Evans's arrangements from this time showed the influence of classical music, and included instruments such as French horns, flutes, and tubas. In 1939, Claude Thornhill was hired for Hope's show, and he became a major influence on Evans.
Evans remained a Canadian citizen until he entered the US Army during the second World War. After 1946, he lived and worked primarily in New York City, living for many years at Westbeth Artists Community.
