Professor, Department of Geographical Sciences, University of Maryland. Remote sensing scientist with a research specialization in large area land cover and land use change mapping. Research focused on developing improved algorithms, data inputs and thematic outputs which enable the mapping of land cover change at regional, continental and global scales. Such maps enable better informed approaches to natural resource management, including deforestation and biodiversity monitoring and can also be used by other scientists as inputs to carbon, climate and hydrological modelling studies.