Brad Stevens was the picture of calm as he sat beside Danny Ainge during the Celtics’ summer league opener yesterday.
He rested his chin on his hand much of the time and let his new boss do most of the talking. Stevens was, at once, studious and relaxed. And maybe a little tired.
The new Celtics coach said he’d just completed a grand slam of sleep, staying four nights in four different places, and was looking forward to the modest continuity of a second consecutive evening on the same pillow — even if it was not his own.

“I’m ready to be in one spot for a few days . . . then a couple more spots and then start looking for homes in Boston,” said Stevens, who followed his introductory press conference in Waltham with a featured ride in a Connersville, Ind., parade Saturday.
He doesn’t really have time to be tired. It appears as though he’s looked at his schedule and, no, can’t fit it in.
There is much to be gleaned for someone whose first NBA job requires a vertical leap to the top rung of his profession. So he sat and watched closely yesterday. Even when Ainge would be turned toward him and speaking, Stevens would generally be looking off to the court — to some players he will be coaching in a few months and to a different version of the game than he is used to.
“It’s interesting,” Stevens said. “I think a lot of coaches are probably down here evaluating the players, and I’m down here getting a better feel for not only the players but the game, the discussion points in the game, some of the things that might be differences between college and pro, which I think there are quite a few. Some of those aren’t being shown out here because they’re playing four 10-minute quarters instead of four 12-minute quarters, and timeout rules aren’t the same — et cetera, et cetera.