My research addresses questions of broad geologic implications concerning changing Earth Systems through time. The research tools are primarily light stable isotopes, radioactive isotopes, trace metals and some of their heavy stable isotopes that allow greater capability to exploit marine and land-based sediments as high-resolution geologic archives. These archives contain the records of present and past changes of atmosphere, ocean, land, climate and biota and their complex interactions. Retrieval of these records requires skill, understanding of their geologic context, and development of archive-specific proxies. The proxy records are essential for improving our ability to understand variability and determine their societal impacts and vulnerability.