Brad Sageman's research is grounded in stratigraphy, particularly the relationship between rocks and time. Much of his effort has been directed at development of high-resolution time scales for ancient stratigraphic sequences through the application of cyclostratigraphic and sequence stratigraphic techniques. The driving motivation for improved time scales builds from his other main research interest, understanding the processes controlling burial of carbon in ancient sediments and the relationships between changes in the global carbon cycle and ocean-climate interactions. A particular emphasis of his work has been Ocean Anoxic Events, and more recently, other major ocean-climate perturbations such as the P-Tr boundary, the K-T boundary and the PETM. He has devoted much of his career to studies of the Cretaceous Western Interior basin of North America, but recent work has included a number of other research sites in Europe and Asia, as well as ODP core samples.