Baltimore Ravens' guard John Urschel is a math whiz
John Urschel, the Penn State math whiz who also happened to play football, retires from NFL
Ex-Raven John Urschel says retirement about math, not concussions
The grad student who gave up football for math
Ravens' Urschel balancing football, math as he competes for starting job, Professional
Ravens' John Urschel on exploring football, math, why and why not - WTOP News
John Urschel, Ravens lineman, retiring from football at 26
Baltimore Ravens: John Urschel smart enough to walk away wealthy
Concerned with long-term damage from head injuries, Ravens offensive lineman John Urschel retires
Sara Does Science — Science Crush Friday - An NFL Player? Really?