Gas-phase kinetics of free radicals; catalytic processes in the atmosphere controlling global change of ozone; high-altitude experiments from balloons and aircraft; development of laser systems for stratospheric and tropospheric studies; development of high-altitude, long-duration unmanned aircraft for studies of global change.
Isotope geochemistry and cosmochemistry; the formation and early differentiation of the terrestrial planets; the chemical evolution of Earth's crust-mantle system; Earth systems evolution and environmental geochemistry.
John L. Loeb Associate Professor of the Natural Sciences and co-Director of Graduate Studies
Isotope geochemistry and historical geobiology. Re-animating ancient ecosystems and ocean chemistry using stable isotope systems, chemical speciation techniques, modern microbial experiments (for calibration) and theoretical considerations.