Joe Mazulla is an American professional basketball coach who is the head coach for the Boston Celtics of the National Basketball Association (NBA). He played college basketball for West Virginia University. Mazzulla joined the Celtics as an assistant coach in 2019 and was appointed the role of interim head coach prior to the 2022–23 season before officially being named head coach in February 2023 before the All-Star break.

In his second season, Mazzulla led the Celtics to a league-best 64 wins and an NBA championship. He currently holds the highest winning percentage of any coach in NBA history with over 150 games coached and is also the youngest head coach in NBA history to win the NBA Finals.

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