Pavel Etingof, Massachusetts Institute of Technology, Cambridge, MA, USAOleg Golberg, Sebastian Hensel: Universität Bonn, Bonn, GermanyTiankai Liu, Massachusetts Institute of Technology, Cambridge, MA, USAAlex Schwendner, Two Sigma Investments, New York, NY, USADmitry Vaintrob, Harvard University, Cambridge, MA, USAElena Yudovina, University of Cambridge, Cambridge, United Kingdomwith historical interludes by Slava Gerovitch, Massachusetts Institute of Technology, Cambridge, MA, USA