April 18
On April 18, 1966, Bill Russell became the first African American head coach in the NBA.
Sources
#blackhistory: On April 16, 1966, Bill Russell becomes the first African American head coach in the NBA. CAAM. (n.d.). Retrieved April 1, 2023, from https://caamuseum.org/learn/600state/black-history/blackfact-on-april-16th-1966-bill-russell-becomes-the-first-african-american-head-coach-in-the-nba