Leendert Adriaan (Sampurno) Bruijnzeel is a Professor of Land Use and Hydrology based at VU University, Amsterdam. He has 35 years of experience with forest hydrological research in the humid tropics, mostly in South-East Asia, the Caribbean, and Latin America. His main research interests include the water and nutrient dynamics of tropical forests, above all montane cloud forests; his other main research topics include the hydrological impacts of land-cover change (deforestation/reforestation) and erosion and sediment transport processes. Professor Bruijnzeel is the author of two other books and the co-editor of Forests, Water, and People in the Humid Tropics also published by Cambridge University Press (2005) and UNESCO as part of the International Hydrology Series. In 2005 he received the prestigious Busk Medal from the Royal Geographical Society.