John Pfaff is a Professor of Law at the Fordham University School of Law. For the past ten years he has studied what caused the unprecedented rise in US incarceration rates from the 1980s through 2010, as well as what reforms are needed to cut back our reliance on prison. He earned both a JD and a PhD in Economics from the University of Chicago.
His work has been featured in the New York Times, the Washington Post, the Wall Street Journal, the Economist, Slate, and other publications. You can also find him on Twitter (a lot).