Many journals and magazines contain biographical information, including interviews and profiles.
You can search for book-length biographies in our Library using the Lumen Catalog. Change 'Keywords' to 'Subject' and this will get you a list of books related to biographies. Use an individuals name to find books about that person. It is not necessary to include the word 'biography' if you search the individual as a SUBJECT.
It's also useful to look in specialized encyclopedias and other reference works, e.g., like those listed in the Gale Virtual Reference Library (GVRL). You can use GVRL's subject search to find biographical reference works:
You can also sometimes find brief biographical information in books written BY your author. It can also be useful to examine what your author has written--search WorldCat, a collection of millions of books housed in thousands of libraries, to see what your author has written. You can also search the individual as a subject in WorldCat to find books we don't own but that you can borrow from other libraries using the Interlibrary Loan service.