For ex-Raven John Urschel, NFL retirement felt more like a change
John Urschel - 2012 All-Big Ten
John Urschel: From NFL Player to Mathematician
Baltimore Ravens' guard John Urschel is a math whiz
MIT's John Urschel On The NFL, Concussions And Settlers Of Catan
From the NFL to MIT: The Double Life of John Urschel
Penn State's John Urschel: Taste for math + chewing up defense
For Ravens' John Urschel, Playing in the N.F.L. No Longer Adds Up
NFL CTE Study Reveals Football's Cruel New Math
At age 26, Ravens' John Urschel retires from NFL to pursue PhD in
NPR Interview: John Urschel, Author Of 'Mind And Matter' : NPR