Quaternary and glacial geology of Arctic areas, with a particular interest in the areas around Iceland, Greenland, and NE Canada.
Ice sheet/glacier ocean interactions. Study of abrupt events, such as Heinrich events, and high-resolution studies of changes in Baffin Bay, the Labrador Sea, and the Nordic Seas over the last 12,000 cal yr. Emphasis on marine sediment archives and the use of X-ray diffraction analysis to detect changes in sediment provenance.
- Penrose Medal, Geological Society of America, 2016
- AAAS Fellow, American Association for the Advancement of Science, 2011
- AGU Fellow, American Geophysical Union, 2006