From the official press release:
Williams, a 6'6" guard/forward, joins the Celtics after competing in the Chinese Basketball Association with the Guangdong Southern Tigers. While with Guangdong, he averaged 17.9 points, 3.4 rebounds, 4.1 assists and 1.2 steals in 29 games. Originally drafted by the New Jersey Nets with the 11th pick in the 2009 NBA Draft, Williams has posted career averages of 7.6 points, 3.9 rebounds and 2.5 assists in 129 games split between New Jersey, Houston and Sacramento.
He'll be in his #55 uniform against the Lakers tonight. Check out these numbers from the Springfield Armor:
Can he be a savior off the bench and replace Rondo, Barbosa, and Sullinger? Absolutely not, but the kid is a baller that could fill a lot of holes.