Tom received a B.A. degree in Geology from Macalester College (St. Paul, MN), and a Ph.D. from the University of Washington (Seattle, WA). His research focuses on understanding major mass extinctions in earth history by employing multiple geologic tools to the same field area and questions. His work has primarily involved stable isotope geochemistry and paleontology, in addition to a component of magnetostratigraphic analysis. Field work is an essential component of his studies, and his current field sites are on the Antarctic Peninsula and in eastern Montana focusing on the end Cretaceous mass extinction.