My primary research focus is to understand tropical forest structure and function over the Amazon region. I have been examining tropical forest disturbances from natural (tree mortality, blow-downs, and droughts) to anthropogenic processes (deforestation, selective logging and fires) using remote sensing technologies, ecological models and long-term ecological experiments. Over the past years I have been working with NASA, JPL and the Brazilian Space Agency (INPE) and using their remote sensing data (airborne LiDAR, Radar and Optical multi-satellite sensors) to understand forest response to multiple environmental stressors as well land-use processes. More recently I have been collaborating with the RAINFOR Network (University of Leeds and Oxford), EMBRAPA (Campinas, Brazil) and INPA (Manaus, Brazil) to quantify terrestrial carbon budget for South America undisturbed tropical forests.