Late Quaternary climate. Cause and consequence of abrupt climate change in the geologic record. Evolution of the tropical Pacific climate & the El NiÃ±o-Southern Oscillation since the last glacial period. Relationship between ENSO and the mean climate state. Holocene evolution of Northwest Atlantic temperatures. Long-term stability of western-boundary currents. Development and application of organic geochemical and stable isotopic techniques in paleoclimatology and oceanography.