• Senior Research Associate, 2020-present, Department of Geography, School of Computing Science, Simon Fraser University, Canada
• Senior GIS Project Manager, 2013-present, Instant Calling Spatial Arch and Resource Planning Management, Canada
• Professor, 2018-present, Associate Professor, 1992-1993, Assistant Professor, 1985-1991, Department of Ecology, Northwest Plateau Institute of Biology, The Chinese Academy of Science, Xining, China