My research focuses on high-resolution paleoclimate records from marine and lacustrine sediments and, more recently, speleothems to better understand past climate dynamics. Field programs involve recovering sediment cores from selected lakes and ocean basins throughout the world and range from simple missions utilizing inflatable boats and hand-operated coring equipment to complex campaigns that utilize oceanic research vessels or lake drilling platforms. For the latter, I am actively involved the Integrated Ocean Drilling Program (IODP) and International Continental Drilling Program (ICDP). My research using deep-sea sediments has been concentrated geographically on the North and South Atlantic Oceans, with the aim of integrating marine sediment and ice core records. The objective is to build marine sediment analogs to the polar ice cores to study ocean-atmosphere linkages and the relative timing, phasing, and interhemispheric coupling mechanisms of climate change between the polar regions. My work using lake sediment cores and speleothems is centered in Mesoamerica, Cambodia and India. The objective is to reconstruct Holocene climate change and, specifically, to explore how climate change may have affected ancient civilisations such as the Maya, Khmer and Indus Valley.