Concerned with long-term damage from head injuries, Ravens offensive lineman John Urschel retires
A Canadian-born Baltimore Ravens lineman just published an incredibly complex study in a mathematical journal
From the NFL to MIT: The Double Life of John Urschel
Baltimore Ravens 2015 Team Preview and Prediction
From NFL to ambassador: John Urschel looking to increase diversity - ESPN - Baltimore Ravens Blog- ESPN
Ravens offensive lineman John Urschel retires
Marshal Yanda leaves a void, but the Ravens will have options to help fill it - The Athletic
Ex-Raven John Urschel says retirement about math, not concussions
NPR Interview: John Urschel, Author Of 'Mind And Matter' : NPR
AMS :: John Urschel - Mathematician and Pro Football Player
Ravens' John Urschel, lineman and PhD candidate, retires from NFL aged 26, NFL
Grad student John Urschel tackles his lifelong balance of math and football in new memoir, MIT News
John Urschel: From the NFL to MIT - WSJ