Professor Lee’s research and teaching concern the interactions between the terrestrial biosphere, the atmosphere and anthropogenic drivers. His areas of interest include boundary-layer meteorology, air pollution meteorology, meteorological instrumentation, remote sensing, carbon cycle science, and China's atmospheric environment. One focus of his research activity is on greenhouse gas fluxes in the terrestrial environment, including forests, cropland and lakes. Other ongoing projects deal with isotopic tracers in the cycling of carbon dioxide and water vapor, haze effects on crop growth and yield, and biogeochemical and biophysical effects of land use on the climate system. He is Sara Shallenberger Brown Professor of Meteorology, Director of Yale-Tsinghua dual degree program, recipient of the 2015 Award for Outstanding Achievement in Biometeorology from the American Meteorological Society, and editor-in-chief for the international journal Agricultural and Forest Meteorology.