My research investigates how demographic and competitive processes within terrestrial plant communities affect large-scale ecosystem dynamics. I've worked on the development of a new terrestrial biosphere model - the Ecosystem Demography model (ED). ED uses moment approximations to capture the large- scale behavior of a stochastic, ‘individual-based’ model of ecosystem dynamics. My group is using the ED model to investigate how the dynamics of fine ‘sub-grid’ scale ecosystem heterogeneity govern the large-scale structure and distribution of terrestrial ecosystems, biogeochemical cycling and biosphere-atmosphere interactions. I am also continuing my research on animal movement, and have recently finished a book on this subject with Mark Lewis, entitled Mechanistic Home Range Models: From Individual Behavior to Large-scale Pattern.