NFL CTE Study Reveals Football's Cruel New Math
John Urschel, MIT mathematician and NFL offensive lineman, retires from football
Ravens' John Urschel, lineman and PhD candidate, retires from NFL aged 26, NFL
John Urschel is retiring, PFF News & Analysis
Former NFL Star John Urschel Talks Mathematics
Ravens guard John Urschel starts work on Ph.D. at MIT
John Urschel makes the best, smartest decision of his life in retiring from the NFL – New York Daily News
MIT's John Urschel On The NFL, Concussions And Settlers Of Catan
John Urschel Stats, News and Video - G
John Urschel: From NFL Player to Mathematician
The grad student who gave up football for math
Ravens' John Urschel, lineman and PhD candidate, retires from NFL aged 26, NFL
Ravens guard John Urschel is living big in a tiny car - ESPN - Baltimore Ravens Blog- ESPN