Ravens' John Urschel did the math and put his future over football
Baltimore Ravens' guard John Urschel is a math whiz
John Urschel Retires from the NFL - Black Shoe Diaries
Ravens Lineman Retires to Pursue MIT Doctorate after CTE Study Released – The Sport Digest
Baltimore Ravens: John Urschel Retires from NFL
Baltimore Ravens Offensive Lineman John Urschel Retires From NFL At 26
NFL player retires after new study shows 99 per cent of brains of dead players with disease
Ravens have now lost seven players to season ending injuries alone - Baltimore Beatdown
John Urschel Should Worry Ravens
Ravens center John Urschel is retiring from NFL
John Urschel smart NFL player, Baltimore Ravens
Ravens' John Urschel on exploring football, math, why and why not - WTOP News
Former PSU, Ravens player Urschel sells virtue of math to youngsters
NFL: John Urschel retires from Baltimore Ravens