Born in Monticello, Mississippi, Jefferson attended Prentiss High School in the small nearby town of Prentiss from 2000 to 2004. After starting for his varsity team as a freshman at Prentiss, he became one of the elite players in the country as a junior, drawing the attention of both college coaches around the country, and the scouts of the NBA. In his senior year for the Bulldogs, he averaged an astounding 42.6 points, 18 rebounds and seven blocks per game as his Bulldogs team went on to lose in the Mississippi state class 3A semi-finals to Byhalia High School 88-73, in which Jefferson finished with 56 points.\n', '

Considered a five-star recruit by Rivals.com, Jefferson was listed as the No. 1 center and the No. 4 player in the nation in 2004. He had originally committed to Arkansas, but opted instead to make the jump to the NBA straight out of high school.\n', '

Jefferson was drafted with the 15th overall pick by the Boston Celtics in the 2004 NBA draft, becoming the first high school player to be drafted by the Celtics (Kendrick Perkins was drafted by the Grizzlies, then traded to Boston on draft day in the 2003 NBA draft). He played primarily as a power forward and averaged 6.7 points and 4.4 rebounds in 14.8 minutes per game during his rookie season.\n', "

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