To find works dedicated to research on an author, do a subject search on the author's name, last name first.
A keyword search on the author's name will find these works, plus works by the author, and sections of more general works.
These are some useful subject headings for use in the Merlin Catalog.
The links will take you to a list of all of the books in the catalog with that subject heading.
The Gale Virtual Reference Library provides specialized online encyclopedias for background information. You can search across the entire collection, or within specific encyclopedias, such as: