The Boston Celtics’ head coach, Joe Mazzulla, is a very odd man. He is also a very good coach.
Take, for example, a story Celtics guard Derrick White told in an interview last November. According to White, the first sound at one Celtics practice wasn’t a whistle.
“[Mazzulla is] like, ‘Play the music!’… and next thing you know, it’s just machine guns going off … you’re in a war zone,” White said. He was laughing – but not really laughing.
The 37-year-old coach scored the sweat session with the sound of death, bullets rat-a-tat-tat over 10 straight minutes of zigzags and full-court pickups. He wanted players’ lungs burning. He wanted them to taste the vomit.
Mazzulla believes – and he believes many things – repetition under stress rewires your brain. Psychologists have spent decades studying how stimuli paired with intensity create recall that bypasses deliberation. The military industrialized it: conditioning, desensitization, immersion. The principle underneath it is simpler and more universal: the brain learns fastest when it’s overwhelmed. Adapt or die.
There’s something unsettling about it all. Basketball borrowing from the logic of war. Every coach will give platitudes about stress inoculation. Mazzulla puts sensory overload into practice. The goal is the same: strip decision-making down to instinct.
Mazzulla’s version of controlled chaos is the sound of gunfire, hence the practice session. Why? So, when weeks later, in the fourth quarter, a guard brings the ball up full court, the crowd is loud, and the game is tight, any player wearing green and white can turn into the Manchurian Candidate: synapses snapping into place to deliver the kill shot into the hoop.
A lot of this is odd. And a lot of what Mazzulla says is odd. He doesn’t really talk like other NBA coaches. His press conferences can sound more like philosophy seminars than strategy. Maybe Mazzulla’s deadpan delivery is Andy Kaufman performance art: half-jokes, half-koans, delivered with a straight face. Players have learned to stop trying to decode everything and just absorb the tone.
He has talked about wanting a wolf to guard his house, never sitting with his back to the door at restaurants in case anyone sneaks up on him and avoiding revolving doors because “if one of them gets stuck, then you’re just a sitting duck”. He wants his players to study the movements of orcas and hyenas to enhance their games.
The thing is, whether it’s because of his quirks or despite them, Mazzulla is a very effective coach. He’s already led the Celtics to one championship, and deserves the Coach of the Year award after leading the injury-riddled Celtics to the second seed in the East this season, while holding the second-best offensive rating, fourth-best defensive rating and third-best net rating.
It should be remembered that Boston were supposed to have a gap year after Jayson Tatum went out last postseason with an achilles injury. Starters Jrue Holiday and Kristaps Porziņģis were both traded. Bench bigs Al Horford and Luke Kornet left in free agency, a harsh cost of survival under the new collective bargaining agreement.
Most teams would have reset. But Mazzulla got in the lab and changed the Celtics’ DNA. He kept the offense organized around spacing, timing and reads, building a system that could function until Tatum’s return. And defensively, he pared it back to the bone: just the raw, flayed nerves of constant ball pressure. This kind of scalable infrastructure helps role players reach their ceiling without your best player.
As the team changed, so did Mazzulla. It would have been easy to ask Jaylen Brown to be Tatum. Instead, he uses every player to their strength.
That’s why Ron Harper Jr, Baylor Scheierman, Hugo González and Luka Garza have been able to step in and up. Even Brown is expected to rebound, run, defend and play with the same energy and physicality the Celtics ask of everybody.
What’s behind the new philosophy? This summer, Mazzulla went to France, where he met with Guillaume Vizade, a fellow basketball oddball and the head coach of Le Mans. Two coaches from different systems tried to crack the code of creating advantages before a defense can set.
Vizade talks about the meeting like a thinktank: “Our shared ideas about arriving into offense while playing, amplifying advantages and creating chaos in opposing defenses connected very quickly during those discussions. I felt both lucky and proud to be able to present some of our methods and actions, and in return, I received even more by exchanging ideas with Joe and his disruptive approach.“
Vizade’s teams don’t just run; they vibrate. Hard-wired into a single hive mind. Like fungi. It’s how Boston play now. When the first option on offense is cut off, the offense doesn’t flinch. It reignites into a sequence of cuts and relocations that open up scoring gaps.
Mazzulla’s COTY case also rests on how much he changed Boston defensively. Last season, the Celtics could let opponents play one-on-one, live with contested shots without fouling. This year, they pick up their opps full-court and pressure the hell out the ball.
When one defender takes a risk, another one fills the space. If someone gets beat, the next man rotates. If that pass gets made, another closeout comes behind it. That’s why Celtics corner-help blocks have become such a staple. Boston are rotating so well they’re forcing opponents to make that one extra pass. Mazzulla has done all this without a great rim protector.
The clearest example of Mazzulla’s approach came in the 2024 Finals, when Dallas kept their big men near the rim, helping off shooters on the weak side to crowd the paint. Early on, it worked. Boston drove into traffic and ended up kicking the ball out late.
Mazzulla’s adjustment was using that help against Dallas. Boston began pulling the help defender toward the ball, often using a guard like Holiday to drag the Mavericks’ big man across the floor. As soon as the help stepped over, they swung the ball to the other side before the defense could recover.
From there, the options were obvious: a layup, a post-up or an open corner three. What looked like simple ball movement was really a smart way to pick apart Dallas’s defense, turning it against itself. Mad scientist-level scheming.
Speaking to last year’s disappointing second-round playoff exit, he said: “Every season exposes yourself to yourself … third year you get a taste for what it’s like to lose.”
That’s how Mazzulla rolls. He shows his players film of orcas and hyenas, predators that never attack all at once. Instead, they circle, shift, waiting for just the right moment before closing in and snapping their prey’s neck. Boston’s offense works the same way. The ball moves from side to side until the defense finally gives up a good shot.
Other outlets have detailed that being a Celtic means embracing the Joe Mazzulla experience. We’re talking about a guy who roams the facility barefoot while delivering instructions in an icy, hyper-focused monotone. He operates the Celtics like a man who knows he’s in the Matrix and wants his team to warp the simulation to their advantage.
The league is in good hands. JB Bickerstaff is honing the blade in Detroit, Mitch Johnson fast-tracked the Spurs mutation, and Mike Brown is restoring Eden in the Garden. But Mazzulla has raced far ahead of the pack for COTY by retooling a depleted contender while staying contending. Insane.
That’s what elite coaching looks like.
That’s why Joe Mazzulla should win Coach of the Year.
Play the music.
