The Celtics have re-signed Keyon Dooling and signed Jason Collins, Jamar Smith and Dionte Christmas. More info here: on.nba.com/OkqEvP— Boston Celtics (@celtics) July 31, 2012
Jeff Green is still absent from the "officially signed" list. We can speculate on the reasons and have a little fun with it, but it's probably just an issue of squaring everyone away first, reading Larry Coon's NBA CBA FAQ, and then figuring out how Green's contract fits under the luxury tax.
Some nice words from Danny from the official press releases:
"Keyon's veteran leadership was a very welcome addition to our locker room last season," said Danny Ainge, Celtics President of Basketball Operations. "His infectious energy both on and off the court is a great asset for this team."
"Jason's ability to defend in the post will be a great addition to this team," said Danny Ainge, Celtics President of Basketball Operations.