I am a soil scientist with interest in interactions between physical, chemical, and biological processes that take place in the soils. My primary focus is in soil chemistry, including dissolution, precipitation, and sorption reactions in the soils with both basic science applications including critical zone processes, mineral-organic interactions and applied research looking at fate and transport of organic contaminants and nano-particles in soils that is relevant to environmental quality. My research in Biosphere 2 is focused on weathering processes and carbon cycling under influence of abiotic and biological factors. Specifically, we examine inorganic carbon sequestration during dissolution of basalt covering Landscape Evolution Observatory slopes and formation of spatial and temporal heterogeneity on the slopes due to its incongruent weathering. We also study biological weathering, how plants and microorganisms influence rock weathering and soil formation and how products of the weathering are compartmentalized within the ecosystem, as well as effect of climate change on these processes. I lead Biosphere 2 BIOGEOCHEMICAL LABORATORY that supports LEO and other Biosphere 2 and University of Arizona projects.