Joe Mazzulla

Joseph Mazzulla was born on June 30, 1988, in Johnston, Rhode Island. He played college basketball as a point guard for West Virginia University, where he contributed to the team’s appearance in the NCAA Tournament each of his four years. During his collegiate career, Mazzulla recorded 700 points and 340 assists. After graduating in 2011, he transitioned into coaching, beginning as an assistant at Glenville State. He then served as an assistant coach at Fairmont State before moving to the NBA G League as an assistant for the Maine Red Claws in 2016-17. In 2017, he returned to Fairmont State as head coach, leading the team to a 22-9 record and an NCAA Division II tournament appearance in his second season.

In 2019, Mazzulla joined the Boston Celtics as an assistant coach. He held this role for three seasons, contributing to the team’s development. In September 2022, he was named interim head coach of the Celtics after a sudden vacancy. His leadership quickly translated into on-court success, and in February 2023, he was officially promoted to head coach, signing a multi-year contract extension. This promotion followed the Celtics achieving a league-best 42-17 record at the NBA All-Star break under his guidance. He was also named Eastern Conference Coach of the Month for October/November in 2022.

During the 2023-24 season, Mazzulla led the Celtics to a league-best 64 wins, securing the top overall seed in the NBA playoffs. He received two Eastern Conference Coach of the Month awards in December and March of that season. His team advanced through the playoffs, ultimately winning the NBA Finals in 2024. This achievement made him the youngest head coach to win an NBA title since Bill Russell in 1969. In August 2025, he signed another multi-year extension with the Celtics, solidifying his position as a key figure in the franchise’s future. Mazzulla currently holds the highest winning percentage of any NBA coach with over 200 games coached.