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Interactions between environmental pollutants and ecological receptors begin when the pollutants become available to the target sites of a live ecological receptor. The ability to characterize the dynamics of the bioavailability of pollutants, their transformation kinetics, and the subsequent ecological response is a keystone to advancing the science in relevant DOE areas, including biogeochemistry, bioremediation, and exposure and risk assessment. Since 1999, the Chemical Ecology research group of the Ecology Department in The Earth Sciences Division at LBNL has pioneered the development and application of several cutting-edge technologies, such as synchrotron radiation-based spectromicroscopy, in vitro human gastrointestinal mimetic reactors, and in vivo mouse protocols that allow for the real-time assessment of bioavailability and biokinetics of environmental pollutants. The Chemical Ecology group intends to establish this capability further by seeking out new projects and new collaborators, as well as expanding our staff, to position us as leaders in the areas of biological and environmental sciences.