I am interested in the interactions between people and agricultural and semi-natural systems which they attempt to manage. In particular, I am interested in the role of plant disease in these interactions as both a target for action and a stimulus for the adoption of particular courses of action. My research group is located in the Plant Pathology Department at UC Davis. We study a range of applied and theoretical issues concerning plant diseases, usually in collaboration with other researchers and typically with some broadly economic angle to the work.