Who is the director of NCIS?

The question is a bit tricky! "NCIS" can refer to a few things:

* The TV series: There isn't one single director for the entire series, as it has had many different directors over its long run.

* The fictional agency: The director of the fictional Naval Criminal Investigative Service (NCIS) is Leon Vance, played by Rocky Carroll.

So, depending on what you mean by "NCIS," the answer is either many different directors or Leon Vance.