She is an anthropologist and biologist with interests in evolution, behavioral ecology, kinship, reproduction, demography, health, social inequality, and quantitative and mixed methods. Her first stream of research involves work with the Mosuo of Southwest China and Vanuatu on issues related to economic development spurred by a thriving tourism industry. Her second stream makes use of historical data from the Japanese period in Taiwan to explore relationships between gender, adoption, fertility, and mortality. Finally, her third stream of research explores variation in breastfeeding practices and their consequences across the globe and their relationship to putative social and economic determinants. Siobhan earned her PhD in Biocultural Anthropology from the University of Washington, and holds a BA in Biology from Cornell University.