Celtics After becoming Celtics head coach, Mazzulla sought out a new challenge and a coach of his own in the world of jiu-jitsu.While fans may miss the sight of Joe Mazzulla's constant gum chewing during Celtics games, the change was not taken lightly by the head coach.After being named interim head coach at the beginning of the season, Mazzulla sought out a coach of his own, someone who could challenge him and get the most out of him.
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