Lee Corey is an agent for the FBI.
He is, more specifically, an undercover agent for C-2, a highly secret department of the FBI responsible for liaison with Interpol in the tracking and recording of criminal activity on an international scale. At least that is how the division was initially scoped to function but in the many years it had existed, its mandate has grown until now its agents were responsible for much more. One of the most experienced of those agents is Corey.
Corey has worked for the Bureau for just over 16 years as the series opens. He got his start as a normal FBI investigator, just out of law school. He was young, excited about his job, and happily married to his long-time sweetheart. Then a car bomb took the life of his lady and with it the enthusiasm for his work. It did not, however, take his drive for vengeance and his determination to stop other such killers who would prey on innocents just as someone preyed on his wife.
So for most of his career he has worked in C-2 going undercover to infiltrate any number of targets from criminals who blow up banks for the money to terrorists who do it for the attention. He even allowed himself to be sent to prison to create an unshakeable cover. He has worked in the deserts and the city jungles and places in between.
And he has acquired an attitude that no one can quite grasp. To some it seems incredible cockiness. To others it is, if not a death wish, certainly a death ambivalence. It makes working with him something many would prefer not to do. Whatever the truth, Corey is hard to pin down and hard to stop.