A 6'8" swingman, Posey has mostly made his name in the league on perimeter defense and rebounding. His quick hands, long wingspan and large frame make him an above-average defender who can guard up to four positions. There are plenty of players who want to be scorers in the NBA, but it takes a different mindset to become a stopper in this league. Posey credits his college coach Skip Prosser with helping him develop as a defensive force and he can see himself becoming the Celtics stopper.
"Bringing the energy and accepting that challenge every night, that's what I take pride in. I take pride in trying to stop people," Posey said. "I like that challenge and if that's what coach wants I'm all for it."

Despite his successful run with the Heat, Posey found himself looking for other employment options this summer. He says he had dialogue with the Celtics throughout the summer but Kevin Garnett's arrival made playing in Boston a very appealing option for guy who's clearly interested in adding to his jewelry collection.
"I waited patiently and I landed here in a great situation where we have an opportunity to win a championship," Posey said. "There [were] other teams out there but I wanted the best chance to win a championship. This is the place to be."

"I've watched him throughout his career," said Celtics executive director of basketball operations Danny Ainge.
"I've watched him score in the post. I've watched him put the ball on the floor and shoot well. Defensively he's a great addition because of his versatility. He can play the three. He can play the two. He can play the four. He can play defense on the point guards in our league. And that versatility is going to give us a lot of options over the course of the season."
"He plays hard and has that experience, and he knows what it takes," Ainge said. "He's played with good players. He knows how to find his spots, also. He's good at slashing off the ball. You have to work for your shots when you play with great players like Shaq and Dwyane Wade."