Joel Kotkin is the Presidential Fellow in Urban Futures at Chapman University in Orange, California and Executive Director of the Houston-based Center for Opportunity Urbanism (opportunityurbanism.org). He is Executive Editor of the widely read website NewGeography.com.

Marco Grassi, of a Florentine family long active as collectors, dealers, and scholars of Renaissance art, completed undergraduate studies at Princeton. After military service, he trained as a fine arts conservator at the Uffizi in Florence, as well as in Rome and Zürich.

Philip Hamburger is the Maurice and Hilda Friedman Professor of Law at Columbia Law School. He writes on constitutional law, including religious liberty, freedom of speech and the press, administrative power, and unconstitutional conditions.