Saskia Sassen is the Robert S. Lynd Professor of Sociology and Co-Directs The Committee on Global Thought, Columbia University (www.saskiasassen.com). Her recent books are Territory, Authority, Rights: From Medieval to Global Assemblages ( Princeton University Press 2008), A Sociology of Globalization (W.W.Norton 2007), and the 4th fully updated edition of Cities in a World Economy (Sage 2011). The Global City came out in a new fully updated edition in 2001. Her books are translated into twenty-one languages. She is currently working on When Territory Exits Existing Frameworks (Under contract with Harvard University Press). She contributes regularly to www.OpenDemocracy.net and www.HuffingtonPost.com.