To search by works by a particular director, do an Author search: i.e. welles, orson
To search works about a particular director, do a Subject search: i.e. welles, orson
You can conduct similar searches for writers and other people.
See also Biographies, Credits and Plots.
Here are some examples of websites on a director. As with any website, note that information in these sites may or may not be authoritative.
Here are some selected subject headings for searching Orbis:
NOTE: These subject headings are about the actual people -- not about films about these groups of people. For example, Spike Lee is an African American director, but not all of his films are about African Americans. Nevertheless sometimes there may be overlap with Themes, Subjects & Characters.
See also Filmmaking & Producing.