Mosi Adesina Ifatunji is an Assistant Professor in the Department of Afro American Studies at the University of Wisconsin at Madison, where he also holds affiliations in the Department of Sociology and at the Center for Demography and Ecology. Before joining the faculty at Madison, he held teaching and faculty appointments at the University of Michigan at Ann Arbor (at the Summer Program in Quantitative Methods of Social Research at the Inter-university Consortium for Political and Social Research) and the University of North Carolina at Chapel Hill (in the Department of Sociology, at the Institute for African American Research and at the Carolina Population Center). His primary research and teaching interests are in racial and ethnic theory and the methods used to study inequality and stratification. He is particularly interested in theorizing how non-physical characteristics (i.e., language, religion and nationality) contribute to racial classification and stratification. He is pursuing these interests using a range of mostly quantitative methods, including large-scale surveys, advanced statistics, linked administrative data, social experiments, and historiography. He has received awards from and been supported by the American Sociological Association, the National Institutes of Health and the Program for Research on Black Americans. Some of his work has been published in Sociological Forum, Ethnic and Racial Studies, Sociology of Race and Ethnicity and the Du Bois Review.