Encyclopedias and dictionaries can be great places to start when researching mathematicians. Try these resources when beginning your search: Online

Try this web site for information on contemporary mathematicians: Looking for historical figures in mathematics, try this site: 
Use the Library's catalog to find books on a specific mathematician. Try a simple keyword search by entering their name:
Sophie Germain
Kurt Gödel
To narrow your results, try using quotations around the name:
"Felix Klein"
Try combining the name with the word "mathematics":
Bertrand Russell mathematics
For more search options, use the "Advanced Search" or filter your results using the checkboxes on the left side of the results page.
If you wish to browse the bookshelves, try these call numbers:
Depending on when the mathematician lived, you may need to use a source which covers that period.
Other useful Library Guides: