Is a professor at the “Luiz de Queiroz” College of Agriculture (ESALQ) from the University of São Paulo (USP), where he teaches courses for undergraduate and graduate students. He worked three years for an international project funded by the Global Environment Facility, part of the United Nations Environment Programme. Large part of his studies were carried out in the Amazon (including his PhD thesis and PostDoc research related to land use change in the Amazon). His main lines of research are related to soil organic matter dynamics in tropical regions, greenhouse gas emissions in agriculture, mathematical modeling applied to soil science, soil properties spatial variability and global climate change. He is an advisor to the numerous national and international foundations and organizations, as well as national governments. He has published 1 edited book, 35 book chapters, and more than 200 scientific papers in peer-reviewed journals and edited volumes. He is affiliated member of the Brazilian Academy of Science, Sociedade Brasileira de Ciência do Solo, International Humic Substances Society, Soil Science Society of America, American Society of Agronomy e Crop Science Society of America.