http://genealogy.math.ndsu.nodak.edu/index.php I just found this, and it's really cool. It has most people with PhDs in math, and their advisers. You can follow people back by PhD adviser. It's surprising how everyone is connected. If you enter in anyone you know, and follow it back, you can find direct relationships to famous mathematicians. A few of my teachers were descendants of Weierstrass (thus Gudermann and Gauss), Liouville, and some other famous mathematicians. It's really interesting.