In this episode, John Spencer is joined by Dr. Saskia Sassen, the Robert S. Lynd Professor of Sociology at Columbia University. She is the author of eight books, including Cities in a World Economy and The Global City: New York, London, Tokyo, and the editor or co-editor of three books, most recently Cities at War: Global Insecurity and Urban Resistance. She joins to discuss her research on global cities, a term she coined to describe cities in which a multiplicity of globalization processes assume concrete, localized forms.