The International Social Science Council (ISSC) is inviting outstanding early career social scientists to become World Social Science Fellows and participate in a World Social Science Seminar on Sustainable Urbanization, the theme of which is: “Urban governance to tackle urban poverty and environmental sustainability.” The core question is: What modes of urban governance are emerging across the developed and developing world to demonstrate that it is possible to tackle the underlying challenges of urban growth, urban poverty and environmental unsustainability?