My research focuses on understanding the interactions between tectonics, crustal evolution and geochemical cycles on a range of time scales. To better understand these interactions, I use radiogenic isotope geochemistry, in particular the rhenium-osmium (Re-Os) geochronometer, Sr isotopes and platinum-group elements (PGE). The Re-Os geochronometer system differs from other geochronological techniques in its ability to provide precise depositional ages for sedimentary rocks, continental lithosphere formation, mineralization ages for ore deposits and maturation ages for hydrocarbon systems. This novel geochronometer holds exceptional promise in our efforts to understand the mechanisms driving many geological phenomena. By combining fieldwork, mineralogy and petrology with geochemistry and geochronology I endeavor to interrogate the rock record of critical transitions in Earth history.My near term research interests are centered on four main areas: 1) refining Earth history records, especially Archean and Proterozoic tectonic reorganizations and eukaryotic diversification, 2) combining geochemical proxies with microfossil and sedimentological analyses from modern-day glaciated regions to better understand the external and internal forces acting on ocean-ice sheet dynamics throughout the Quaternary, 3) understanding hydrocarbon systems and ore genesis through the use of geochronology and geochemistry, and 4) integrating the Re-Os geochronometer into the EARTHTIME organization and leading an international effort for inter-laboratory standardization.