[1][2] At 6 ft 3 in (1.91 m), 175 pounds (79 kg), Douby played shooting guard for the Rutgers Scarlet Knights.

[4] In his senior year, Douby averaged 35.6 points per game, leading Grady to the PSAL semifinals.

[5][6] Douby initially committed to Hofstra University to play basketball,[6][7] until head coach of Rutgers University men's basketball team, Gary Waters jumped in and swayed Douby to commit to the Scarlet Knights.

As a freshman at Rutgers, Douby scored 35 points to lead the team to an overtime victory in the NIT semifinal game.

[3] Douby scored a Big East season high and Carrier Dome opponent record 41 points at Syracuse on February 1, 2006.

[3] After leading Rutgers to a first-round victory in the Big East tournament over Seton Hall, Douby dropped 31 over the #2 Villanova Wildcats.

On February 18, 2009, Douby was waived by the Kings in order make room for the trade that included Brad Miller and Drew Gooden.

[18] On November 17, 2009, Douby signed a one-year contract with the Turkish team Darüşşafaka Cooper Tires.

[19] He finished as the top scorer of the Turkish Basketball League, averaging 23.6 points and 4.9 assists per game for his team.

On September 17, 2010, Douby signed a one-year contract with the Chinese team Xinjiang Flying Tigers.