"Charles Samuel Addams ( January 7, 1912 – September 29, 1988) was an American cartoonist known for his particularly black humor and macabre characters. Some of the recurring characters, who became known as The Addams Family, became the basis for two live-action television series, two cartoon series, and three motion pictures." (Wikipedia) There is also the recent The Addams Family new musical and Addamses: The Addams Family blog!
Chas Addams is still very popular today and inspires many modern cartoonists. People adhering the goth subculture would certainly like his work.
Let me show you some of his books. Jean-Marie helped me gathering the book covers.
I'll start with an example of the only Addams book I have in my collection: Addams and Evil (New York, 1965):
These are covers of other Chas Addams books:
Tee & Charles Addams Foundation (recommended)
Chas Addams & The Addams Family on Wikipedia
The Addams Family musical - sights and sounds (recommended)
The Addams Family Blog
Charles Addams book gallery on Pbase
Chas Addams cartoons
Chas Addams on CBS Sunday Morning 1994 (on Mike Lynch Blog)