I am a theoretical ecologist and applied mathematician interested in population and community dynamics. My research areas encompass: (1) Developing statistical and mathematical models for estimating organismal occupancy, abundance, and density. ( 2) The temporal and spatio-temporal dynamics of nonlinear ecological systems for multitrophic interactions (predator–prey, host–parasite, and mutualist–host), particularly statistical and mathematical approaches to scale-up systems from small, individual, levels to population levels. (3) The response of nonlinear ecological systems to environmental variability and the application of nonlinear time series analysis to identify key environmental drivers and the response of individuals, populations and communities to these drivers. In particular, the nonlinear dynamics of diapausing insect populations and arthropod-borne viruses to climate change, including aspects of evolutionary change in population and community structure. I am interested also in the nonlinear dynamics of infectious diseases in response to environmental variability. The main disease I have studied is influenza (H5N1 avian influenza), but work is also underway on the Dengue virus and HIV. (4) The relationship between structure and dynamics in large networks of ecological interactions (consumer-resource, mutualistic, and parasitic links).