Jordan Ellenberg is the John D. MacArthur Professor of Mathematics at the University of Wisconsin-Madison and a 2015 Guggenheim fellow. He has lectured around the world on his research in number theory and delivered one of the invited addresses at the 2015 Joint Mathematics Meetings, the largest math conference in the world. His writing has appeared in The New York Times, The Washington Post, The Wall Street Journal, The Boston Globe, Wired, and The Believer, and he has been featured on the Today show and NPR’s All Things Considered. He writes a popular column called “Do the Math” for Slate.