Cook-Martín is a political sociologist who studies international migration, race, ethnicity, law, and citizenship in a global field of politics. He has written widely on immigration and nationality policy, ethnicity, and citizenship. In an era of increased global migration, he is particularly interested in the impact of migration and deportation on communities, how past immigration laws shape contemporary policy, new regimes of temporary migration, and the ways that people understand their relationship to their countries of origin, especially in terms of dual or plural citizenship. Cook-Martín is a member of the Migration/Immigration Network for the Social Science History Association and of the International Migration, Latino Sociology, Race, Class and Gender, and Law and Society sections of the American Sociological Association. He also belongs to the American Historical Association and the American Political Science Association. Cook-Martín has been a research consultant on contemporary international migration issues for the Ministry of Science, Technology and Productive Innovation in Buenos Aires, Argentina. Cook-Martín is an associate professor of sociology at Grinnell College, where he also serves as director of the Center for International Studies. He has placed students in internships with key immigration attorneys in the state, including with Sonia Parra, an attorney who handled many of the ICE Postville raid cases beginning in 2008.