David Sinclair is a fictional character in the crime drama series Numb3rs, portrayed by Alimi Ballard.
First introduced in the pilot episode, he has become the usual partner of FBI Special Agent Colby Granger (Dylan Bruno) and has also become the primary relief supervisor for the Supervisor of the FBI Violent Crimes squad, Don Eppes (Rob Morrow).
Even with the possibility of Colby having been a triple agent and the will to save him, David is not ready to see his partner yet, as he feels he does not really know him.
David was assigned to work with Don Eppes in the pilot episode, by the assistant director.
He has knowledge of bomb disposal due to his first posting overseas in Tel Aviv, Israel.
David's two best friends in childhood were Ben Ellis and Earl Day, as revealed in the episode "Contenders".
He grew up in the Bronx, attended Cornell University ("Black Swan"), and has mentioned growing up dodging gangs to get an education.
Sinclair enjoys Alan's cooking and he is infatuated with medical examiner Claudia Gomez (Lauren Vélez).
David is then asked to lead the team, including Don, into a home invasion in progress.