Library catalogs are a great resource for finding books about a profile subject as well as works by them.
For more recent individuals who are less famous or have yet to make it into reference works or other books, newspapers and magazines are a possible source of information. Some news databases even allow you to limit your search to interviews and biographical information. You might also search these to find out if your subject has every published any articles. A sampling of databases that search newspapers and other periodicals follows (for more, see the News Sources Research Guide).