Steven David Levitt is an American economist and co-author of the best-selling book Freakonomics and its sequels (along with Stephen J. Dubner). Levitt was the winner of the 2003 John Bates Clark Medal for his work in the field of crime, and is currently the William B. Ogden Distinguished Service Professor of Economics at the University of Chicago as well as the Faculty Director and Co-Founder of the Center for Radical Innovation for Social Change at the University of Chicago which incubates the Data Science for Everyone coalition. He was co-editor of the Journal of Political Economy published by the University of Chicago Press until December 2007. In 2009, Levitt co-founded TGG Group, a business and philanthropy consulting company. He was chosen as one of Time magazine's "100 People Who Shape Our World" in 2006. A 2011 survey of economics professors named Levitt their fourth favorite living economist under the age of 60, after Paul Krugman, N. Gregory Mankiw and Daron Acemoğlu.