He was also a coach.
See his career history.
https://en.wikipedia.org/wiki/Bill_Russell
As player:
1956–1969 Boston Celtics
As coach:
1966–1969 Boston Celtics
1973–1977 Seattle SuperSonics
1987–1988 Sacramento Kings
Quite a section on the Wiki post about how racism affected him.
The FBI maintained a file on Russell and described him in their file as “an arrogant Negro who won’t sign autographs for white children”.