Guixing is a senior GIS scientist specializing in applying GIS techniques in understanding public health, sociology and environmental phenomena. He holds a Ph.D. degree in GIS from Texas State University. He has been working on GIS for more than ten years. His expertise includes spatial analysis, data mining, GIS programming, spatial databases, geo-computation and web mapping. His current research focuses on personal exposure assessment, data mining of social media data, human mobility and travel behavior modeling and geovisual analytics.