Ravens' Urschel balancing football, math as he competes for starting job, Professional
Vontae Davis of Buffalo Bills Retires During an N.F.L. Game - The New York Times
John Urschel, the Penn State math whiz who also happened to play football, retires from NFL
Baltimore selects Mississauga's Brent Urban, first Canadian taken in NFL draft; Ravens also pick Winnipeg's John Urschel
John Urschel Off To Hot Start In Rookie NFL Season
AMS :: John Urschel - Mathematician and Pro Football Player
Ex-Raven John Urschel says retirement about math, not concussions
Marshal Yanda leaves a void, but the Ravens will have options to help fill it - The Athletic
Baltimore Ravens: John Urschel smart enough to walk away wealthy
I quit NFL after making $2m in just three years - now I'm a mathematics genius and chess whizz teaching others
2016 cheat sheet: Baltimore Ravens, NFL News, Rankings and Statistics
MIT's John Urschel On The NFL, Concussions And Settlers Of Catan
Ravens offensive lineman John Urschel retires
Ex-Raven John Urschel says retirement about math, not concussions
John Urschel makes the best, smartest decision of his life in retiring from the NFL – New York Daily News