Justin Jackson Joins Boston Celtics Summer League Team Posted Jul 11, 2022 Justin Jackson, the 2017 ACC Player of the Year, was added to the Celtics' Summer League roster Monday. The UNC product spent last season as a member of the Texas Legends in the G League and now finds himself with Boston's Summer League team. The 27-year-old's first chance to get on the court with the Celtics comes Monday against the Bucks. (CBS Sports)