Introduction. Migration Theory: Talking Across Disciplines 1. Historical Migration Studies: Time, Temporality, and Theory 2. Demography and Migration: The Wildcard in Population Dynamics 3. Economic Aspects of Migration 4. The Sociology of International Migration 5. Theorizing Migration in Anthropology: The Cultural, Social, Phenomenological, and Embodied Dimensions of Human Mobility 6. Geographical Theories of Migration: Exploring Scalar, Spatial and Placeful Dimensions of Human Mobility 7. The Politics of International Migration: How Can We Bring the State Back In? 8. Law and Migration: Constants, Challenges, and Changes 9. The State of Migration Theory: Challenges, Interdisciplinarity and Critique