Steve is interested in the anatomy, genealogy, and evolution of fossil vertebrates. Particular research interests are the origin and early evolution of dinosaurs in the Triassic, the anatomy and genealogy of carnivorous theropod dinosaurs (T. rex and kin), the evolution of birds from theropods, the end-Cretaceous mass extinction, the recovery and radiation of mammals after the end-Cretaceous extinction, and the evolution of marine crocodylomorphs during the Mesozoic. He currently does fieldwork in the Triassic of Portugal and Poland, the Cretaceous of Romania, and the Cretaceous-Paleogene of New Mexico (USA), aimed at understanding major evolutionary radiations and extinctions. His work has appeared in journals such as Science, Proceedings of the National Academy of Sciences, and Nature Communications, as well as more specialist journals. He is the author of the recent textbook Dinosaur Paleobiology (Wiley-Blackwell, 2012), meant for higher-level undergraduates and graduate students.