I'm John Urschel, MIT mathematics PhD student and retired NFL
In wake of CTE study, Ravens' smarty John Urschel retires from
Ravens' John Urschel, lineman and PhD candidate, retires from NFL
For John Urschel, math was his passion—and concussions a concern
Ex-Raven John Urschel says retirement about math, not concussions
John Urschel retires from the NFL at age 26
For John Urschel, math was his passion—and concussions a concern
John Urschel, Ravens lineman, retiring from football at 26
Schefter] Another early retirement: Ravens OL John Urschel is