Research in my laboratory addresses the evolution of extinct land vertebrates (tetrapods), especially those from fossil deposits of the Age of Dinosaurs (the Mesozoic). This research is grounded in the fossils discovered by expeditions I have organized or been part of, and focuses on the evolutionary relationships of dinosaurs, crocodylians, pterosaurs, and lepidosaurs. Questions addressed by my lab include which extinct groups are most closely related to their living relatives (birds, crocodylians, sphenodontids, squamates, turtles), what the fossils tell us about the transition to the living group, and how fossils inform us about the early evolution of these groups.