Current research includes systematics of late Paleozoic lungfish. Cenozoic history of Florida and South America. Current research includes studies of the Cenozoic faunas of the Amazon Basin. Current research includes information management of paleontological data. Late Paleozoic invertebrate fossils.
Current research includes origin and early evolution of mammals.
Hydrological systems, water resources, climate change, coral reefs, and atoll island environments. Current research includes effects of climate variation on the quality and quantity of water resources and the role of sea level and carbonate saturation state in determining the structure and function of coral-reef communities. Log analysis and sedimentology. Current research includes applications of log analysis to subsurface geology, mathematical geology, sedimentology, and petroleum geology. Quaternary geology, geomorphology and archaeological geology.