My research focuses on the evolution, paleoecology, and biogeography of Cretaceous and Paleogene mammals. My paleontological fieldwork in the North America (North Dakota) is aimed at documenting mammalian survivorship and recovery following the end-Cretaceous extinctions. As I work with the commonly preserved remains of mammals (i.e., teeth and jaws), I have also explored diet reconstruction, large-scale patterns of dental evolution, and reciprocal studies of tooth evolution and development. Finally, I am interested in applying empirical estimates of the completeness of the fossil record to macroevolutionary issues, such as the time and place of origin of modern placental mammals.