Sources: Prominent member of Celtics organization wanted to fire Brad Stevens during regular seasonStevens was officially named Celtics' new head of basketball operations6/2/2021, 2:32 PMIan BegleyNBA InsiderBoston Celtics head coach Brad Stevens coaches his team against the Brooklyn Nets during the second quarter of game five of the first round of the 2021 NBA Playoffs at Barclays Center. / Brad Penner-USA TODAY Sports