Former NFL player talks mathematics, football and college
Ex-Raven John Urschel says retirement about math, not concussions
John Urschel's retirement was a case of simple math - The Boston Globe
For math scholar John Urschel of Ravens, playing football adds up
Former NFL Player Tackles Football And Math
John Urschel Named to College Football Playoff Selection Committee
Baltimore Ravens' guard John Urschel is a math whiz
Ravens' John Urschel, lineman and PhD candidate, retires from NFL
Baltimore Ravens offensive lineman John Urschel retires abruptly
John Urschel smart NFL player, Baltimore Ravens
John Urschel Stats, News and Video - G
Ravens center John Urschel accepted into PhD program at MIT - NBC
For Ravens' John Urschel, Playing in the N.F.L. No Longer Adds Up