I am an evolutionary anthropologist interested in humans’ adaptations to culturally structured worlds. To this end I am engaged in two primary lines of research.

1. •I study psychological adaptations for processing ethnic social categories. I address questions of intergroup relations and social cognition through cross-cultural and developmental research in the United States and among agro-pastoralists in the Peruvian altiplano along the Quechua-Aymara linguistic border.
   

1. •I am working on the Family Matters Project with Rebecca Sear to explain cross-cultural     variation in how kin affect fertility and other reproductive outcomes.