Joe Mazzulla has done it again. The Boston Celtics head coach led his team to yet another dominant 55+ win season in the 2025-26 campaign, cementing his reputation as one of the sharpest minds in the game today.

Known for his calm, even-keeled demeanor in post-game press conferences, Mazzulla brings a different energy when he's on the court. That intensity has paid off in a big way. Over four seasons as Boston's head coach, he now holds the highest win percentage in NBA history among those with at least 200 games coached. With 328 games under his belt, the Celtics boast an impressive 238-90 record, never finishing lower than second in the Eastern Conference standings.

While the season ended with a shocking Game 7 home loss to the Philadelphia 76ers in the first round, there's plenty of optimism heading into 2026-27. Mazzulla is expected to have a healthy roster ready to bounce back stronger than ever.

Let's take a look back at some of coach Mazzulla's best moments from the 2025-26 season—from tactical masterstrokes to those signature sideline reactions that remind us why he's the perfect leader for this Celtics squad.