* WorldCat (worldcat.org): This database searches the collections of libraries worldwide and can often find information about authors and their works.
* Library of Congress: (loc.gov): You can use the Library of Congress catalog to search for books by author, title, or subject.
* Google Books: (books.google.com): This search engine will show you results from books that are available online.
If you provide any additional information, such as a possible book title, genre, or a rough time period of publication, it might help in identifying the author.