My primary area of research is mathematical biology. I am interested in mathematical modeling of human physiological systems and in population biology. For example, one of my current projects is to predict the future population sizes of the species in an ecosystem, when some of the species are subjected to seasonal harvesting. If I am not careful, my research can stray into the mathematical theory of dynamical systems. Usually this involves bifurcating and chaotic structures in maps, and their relationship to behavior in originating flows.