My current research encompasses two major areas: (1) phenological responses of plants and insects to climate, and (2) the causes and consequences of spatial and temporal variation in species interaction. The first of these continues and builds upon a 48-year dataset of detailed phenological responses of ~150 plant species and a 14-year data on ~200 native bee species. We are expanding this project, which has previously focused on species-level responses, to individuals and communities. The second research area includes empirical and theoretical work on plant-insect interactions. We work on spatial neighborhood effects on herbivores and pollinators in both natural and agricultural systems, and help to lead a global network on variability in insect herbivory.