Professor Gastaldo is a paleontologist and sedimentologist whose focus is on terrestrial ecosystems ranging from: the earliest colonization of land by plants in the Silurian and Devonian; through the Carboniferous, during which time our largest coal reserves accumulated under glacial and interglacial conditions akin to today; to the effects of Mass Extinction on ecosystems at the Permian—Triassic Boundary; and with the processes responsible for preservation of fossil assemblages from the earliest stratigraphic records into the Neogene using actualistic studies in modern environments.