You can search the Library's front page search engine (called Primo) to find full length monographs on an author (or a particular work) as well as essays and chapters appearing in books.
When searching library catalogs, add the keywords 'criticism and interpretation' to the author's name and you'll surface works of criticism that cover several of the author's texts:
Conrad, Joseph, 1857-1924 -- Criticism and Interpretation.
Arendt, Hannah, 1906-1975 -- Criticism and interpretation..
Woolf, Virginia, 1882-1941 -- Criticism and interpretation.
Atwood, Margaret, 1939 -- Criticism and interpretation.
For very famous texts, you can search the title as a SUBJECT heading and that search will surface critical works.
Coetzee, J. M., 1940- Disgrace
The MLA International Bibliography gets its own box on this page as it is the major resource for doing research in the literatures of all languages. The MLAIB provides citations to journal articles, books, book chapters, and dissertations You will also find it useful for linguisics and folklore. There are two especially useful ways to limit a search in MLA - primary author or primary work and source type.
MLA searches by using the Primary Subject Work or Primary Subject Author fields.
A "normal" MLA search for criticism of the novel Heart of Darkness (note the large number of resulting citations).
Use the 'Select a Field' option to narrow the focus of your result set.
There are many fields in the MLA records, you will need to scroll down to choose Primary Subject Work or Primary Subject Author.
Notice how much smaller the set of records is:
You can also make use of the Source Type limiter in the left hand column to retrieve particular kinds of citations, a citation to a journal article or a citation to a book chapter or a citation to a monograph.