Concussions played a part in his decision. Good to see a pro uses his brain in addition to his muscles.
smarty pants
Baltimore Ravens offensive lineman John Urschel, the NFL's mathematics expert, abruptly announced his retirement from football at the age of 26
Urschel is pursuing his doctorate at the Massachusetts Institute of Technology in the offseason, focusing on spectral graph theory, numerical linear algebra and machine learning.
smarty pants