William Bleam is Professor of Soil Science at the University of Wisconsin, USA. His research interests include physical chemistry of soil colloids and sorption processes, chemistry of humic substances, factors controlling biological availability of contaminants to micro-organisms, magnetic resonance and synchrotron studies of adsorption and precipitation. He has taught an intermediate soil chemistry course (Soil Science 321, Soil & Environmental Chemistry) since 2006. Students taking this course include undergraduate and graduate students.