Use OneSearch, the library's catalog to find books, articles, DVDs, CDs, and more.
For a SPECIFIC person's biography, you can search by his/her name, or you can keyword "name and (biograph* or autobiograph*)" to see if there is a whole book about them, or perhaps a chapter in a book.
On the right-hand side panel, under “Resource Type”, change it to “Books”.
If you see “Available online”, you can click and view the book in its electronic form.
If you see “Available”, you can write down the call number and find it in the library.