My research straddles three disciplinary realms: demography, contemporary Chinese society and global health. I focus on a range of population and health issues in developing countries that intersect frontline public policy, such as the role of China's population control program in lowering fertility preferences and fertility rates in China, the social and behavioral determinants of HIV and other sexually transmitted diseases and the methodological evaluation and implementation of network-based approaches to sample hard-to-reach and hidden populations such as those at risk of contracting HIV/AIDS and other sexually transmitted diseases as well as undocumented migrants.