Looking for a full-length biography of someone? Search using the person's name as your search term.
A scholarly biography will often give you information on primary sources (collections of papers, official documents, etc.) that may be available on that individual. So check the bibliography and notes!
If you're looking for works for which that person is responsible for most of the content (an autobiography; photographs; news reports; etc.) search as above but change your keyword search to an author search.
This database is a a great place to get an overview on a particular person and will link you to books, scholarly articles, and more resources on that person.