John Urschel is a doctoral student in mathematics at the Massachusetts Institute of Technology who has already published several well-received papers. What’s even more remarkable is that before pursuing his Ph.D., he played professional football for three seasons with the Baltimore Ravens. Urschel talks to host Steven Strogatz about juggling two demanding careers, his decision to trade in football for math, and the kinds of math problems that fascinate him. This episode was produced by Camille Petersen. Read more at QuantaMagazine.org. Production and original music by Story Mechanics.