Professor Guarnizo is interested in the economic and political sociology of international migration and development. His research focuses on migrants’ mode of socioeconomic incorporation and political participation, the relationship between migration and citizenship, and migration and socioeconomic change and inequality at the local, national, and transnational scales. His work combines quantitative and qualitative methods in migrants’ places of origin and destination. He has studied these processes among Latin Americans in the United States and the European Union, as well as in s. His work has been published in the American Journal of Sociology, American Sociological Review, International Migration Review, The Annals of the American Academy of Political and Social Science, Journal of Economic and Social Geography, and Ethnic and Racial Studies, among others.