He has experience in GIS, spatial statistics, spatial sampling design, data analysis, data mining, air pollution exposure assessment, climate change, GPS application in environment health, human behavior classification, large data sets, spatial database and software design and implementation. His current research focus is on evaluating the effects of climate change on public health and environmental justice, and the relation between adverse health effects (eg. cancer risk) and social/economic status and environmental health. He earned his Ph.D. at the National Key Laboratory of Resources and Environmental Information System in Beijing, and did postdoctoral work at the University of California, Irvine.