JOHN H. MOLLENKOPF is associate professor of political science at the City University of New York Graduate Center. MANUEL CASTELLS is professor of planning at the University of California, Berkeley and professor of sociology at the Universidad Autonoma de Madrid. CONTRIBUTORS: Thomas Bailey, Charles Brecher, Steven Brint, Manuel Castells, Frank DeGiovanni, Matthew Drennan, Stephen Duncombe, Cynthia Fuchs Epstein, Norman Fainstein, Susan Fainstein, Ian Gordon, Michael Harloe, Richard Harris, Raymond Horton, Sarah Ludwig, Lorraine Minnite, John Mollenkopf, Mitchell Moss, Saskia Sassen, Edward Soja, Mercer Sullivan, Ida Susser, and Roger Waldinger