I study the tectonics and geochemistry of continental margins, focusing on the North American Cordillera. Ongoing research includes 1) understanding the mechanisms that drive crustal melting in the N.A. Cordillera and its significance for regional tectonics, 2) reconstructing the tectonics of the central Sierra Nevada and Walker Lane and 3) constraining the processes that drive the large scale movement of material within subduction zones. I use a wide variety of tools to address these problems including thermodynamic modeling, geochronology, geothermobarometry, and other microanalytical techniques (e.g. EMPA, EBSD, LA-ICPMS).