Joseph Mazzulla 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.
College coaching career
Shortly after graduating from college, Mazzulla was offered a coaching job at Nova Southeastern, but turned it down to pursue professional opportunities. He did not find any suitable opportunities overseas, and in September 2011, Mazzulla joined Glenville State as an assistant.
In 2013, Mazzulla was hired as an assistant at Fairmont State under Jerrod Calhoun in 2013. During the 2016–17 season, Mazzulla served as an assistant for the Maine Red Claws of the NBA G League. He was named head coach of Fairmont State in March 2017. In his second season, Mazzulla led the team to a 22–9 record and appearance in the 2019 NCAA Division II Tournament, where they lost in the first round to Mercyhurst, 63–60, in overtime.
In June 2019, Mazzulla was hired as an assistant coach of the Boston Celtics.
On September 22, 2022, just days before the beginning of training camp, Mazzulla was named interim head coach for the Celtics after Ime Udoka was suspended for the whole 2022–23 NBA season. On December 1, 2022, Mazzulla was named Eastern Conference Coach of the Month for October and November, following the Celtics beginning the season with a league-best 18–4 record. On January 30, 2023, he was named the head coach for Team Giannis for the 2023 NBA All-Star Game. Two and a half weeks later on February 16 2023, the Celtics officially named him head coach and signed him to a contract extension. In April, Mazzulla was named one of three finalists for NBA head coach of the year. The Celtics entered the playoffs with the second-best record in the Eastern Conference. Despite their high seed and experience in the NBA finals the year prior, the team struggled in the postseason. The team lost in the Eastern Conference Finals in seven games to the Miami Heat. Mazzulla was retained as head coach for the 2023-24 season and received the endorsement of team president Brad Stevens, who called him "a terrific leader" and "accountable."