Michael Crichton is a/an Film directorFilm director has example: Woody AllenWoody Allen is a/an Film director
[Human]: Do oyu know of any books written by Michael Crichton? [Assistant]: Michael Crichton is not only an author but a film producer and director as well. He wrote the book Disclosure. Does this interest you?  [Human]: I didn't know he was a Film Director. Is his films similar to Woody Allen, or William Nicholson? 
Yes, Woody Allen is an author and film director as well. He wrote Annie Hall which is a romantic comedy.