Eugene Thamon Simpson was a master musician, choral director, composer and arranger of Spirituals, and biographer of Hall Johnson. He was a personal friend and advisor of the Schiller Institute NYC Chorus and its founder, Diane Sare.

https://www.inquirer.com/obituaries/eugene-simpson-obituary-rowan-university-music-new-jersey-20210514.html

You can find more about Dr. Simpson on the African-American Spirituals page in the Conservatorio.
https://www.sinycchorus.com/african_american_spirituals