Professor Cohen arrived at the New School from the University of New York, where he had been the recipient of a grant from the International Center for Advanced Studies and where he had been joint professor in the Robert F. Wagner Graduate School of Public Service. From 1972 to 1999 he worked with the World Bank and was the head of several research projects in more than fifty countries. He was deeply involved in projects connected with infrastructures, the environment and sustainable development. From 1994 to 1998 he was a senior advisor to the Vice-president of Sustainable Development and the Environment, for the World Bank. He has published several books on urban development, on Africa, and on the evaluation of the impact of aid on development. He has also published various articles on the topics and participated in different conferences throughout the world. Prof. Cohen is a member of the U.S. National Academy of Sciences experts group on urban dynamics. He is currently completing his research on urban inequality in Buenos Aires, where he worked from 1998 to 1998. Between 1970 and 2000 he participated in the drawing up of various projects related to research into urban co-operation on an international level in ten thousand cities and towns. While working in Buenos Aires, he co-operated with the "Buenos Aires 1910: Memory of the Future" exhibition which visited New York (February-March 2002). Prof. Cohen has taught courses in the University of California - Berkeley, Johns Hopkins University and the University of Buenos Aires, where he is an advisor to the Dean of the Architecture, Design and Urban Planning Faculty.