My primary fields of study include glacial geology and geomorphology, paleoclimatology, and volcanology. Most of my work places a strong emphasis on geochronology and/or understanding mechanisms of climate change. Past and present research projects generally address problems by integrating field work, laboratory methods, and modeling exercises. The application of cosmogenic isotope surface exposure dating methods figures prominently in many of these projects. My main study sites are located in the western United States (particularly the greater Yellowstone and Grand Teton regions), Iceland, and the Peruvian Andes, but I have also worked on projects in Alaska, Hawaii, and the Galápagos Islands. Timescales of interest generally fall within the Quaternary Period; I am especially interested in glacier fluctuations, climate variability, and volcanic activity during the late Pleistocene and Holocene.
