Ezra Sims
Born: 16th January 1928, Birmingham, Alabama, United States
Died: 30th January 2015, Boston, Massachusetts, United States
Nationality: American
Ezra Sims was one of the pioneers in the field of microtonal composition. He invented a system of notation that was adopted by many microtonal composers after him, including Joseph Maneri.
His professional debut (12 note ET music) occurred on a Composers Forum program in New York, 1959. In 1960, compelled by his ear, he began writing microtonal music, and continued to do so for the rest of his life, with the occasional exception being taped music for dancers. His last composition in quarter tones (his sixth microtonal one) was his Third Quartet (1962).
Read more at https://en.wikipedia.org/wiki/Ezra_Sims