September 23, 2022 11:53 am Brad Stevens: ‘I believe in Joe Mazzulla's leadership' Brad Stevens talks about the #Celtics interim head coach, Joe Mazzulla Celtics Videos 1:42 Kristaps Porzingis on his progress and timeline for injury 0:37 Joe Mazzulla: ‘Process of winning' remains the same from regular season to playoffs 0:39 Al Horford: Closing out Heat in Game 5 ‘shows growth' for Celtics 2:35 Celtics earn dominant series win over Heat 4:35 Mazzulla – Part Two: Sacrifices and Mindset