I am a plant ecologist with diverse, primarily conservation-oriented interests. My main research projects include: (a) assessing patterns in the geographic and taxonomic distribution of rare plants in the US and Canada; (b) predicting the effect of habitat fragmentation on distribution shift potentials of trees under global warming scenarios; and (c) monitoring of rare plants performance, including population viability analysis and predictive habitat modeling. I have ongoing long-term monitoring projects on mapped forest plot community dynamics (1986-present) and the population dynamics of the endangered tree, Torreya taxifolia, (1989-present), both in northern Florida. My research over the next several years will focus on: (a) population persistence of rare plants in California urban areas; (b) interactions among native herbivores, fire and livestock on forest stand structure in Tanzanian miombo; and (c) dynamic modeling of mutualisms within the context of economic models.