Image Credit: Getty Images Joe Mazzulla has quickly risen through the NBA coaching ranks to become one of the league's youngest and most talked-about head coaches. After taking over the Boston Celtics in 2022, he's led the team through high-pressure playoff runs and cemented his place on the sidelines. On August 8, 2025, Mazzulla signed a multi-year contract extension with the Celtics, "This is truly a blessing," Mazzulla said in a statement. "I would not be here without my faith, my wife, and my children.