Keith Paustian is University Distinguished Professor at Colorado State University, in the Department of Soil and Crop Sciences, and Senior Research Scientist at the Natural Resource Ecology Laboratory. A major focus of his work involves modeling, field measurement and development of assessment tools for soil carbon sequestration and greenhouse gas emissions from soils. He has published over 250 journal articles and book chapters. Current research activities include development of the inventory methodology used to estimate US soil C and N2O emissions that are reported annually by EPA to the UNFCCC; development of a web-based tool (COMET-FarmTM) for estimating on-farm greenhouse gas (GHG) emissions and carbon sequestration used by USDA (http://cometfarm.nrel.colostate.edu/) and project-scale systems for GHG assessment of sustainable land management projects in developing countries (http://www.unep.org/cbp_pim). He has served as Coordinating Lead Author for the Intergovernmental Panel on Climate Change (IPCC) Greenhouse Gas Inventory Taskforce and on numerous other national and international committees involving climate and carbon cycle research. He currently serves on a National Academy of Sciences panel for ‘Developing a Research Agenda for Carbon Dioxide Removal and Reliable Sequestration’.