<p>I looked around online and counted the number of Fields medalists associated with several top math departments, but I couldn't find any evidence that Princeton has the most Fields medalists. The following list is probably biased in Chicago's favor because I know exactly which of the winners were Chicago graduates. I'd be interested to see more accurate counts if anyone has them.</p>
<p>Institute for Advanced Study: 34
University of Chicago: at least 10
Princeton University: at least 8
Harvard University: at least 5
University of California, Berkeley: at least 5
MIT: at least 2</p>
<p>The IAS has an impressive record considering only 48 people have won the Fields medal. Of course you can't apply to the IAS for college, so it doesn't much matter!</p>