is a board member for the nonprofit organization Grandstaircase Escalante Partners
and Curator of Dinosaurs at the Denver Museum of Nature & Science
, where his research focuses on Late Cretaceous dinosaurs and their ecosystems. His field-based work has taken him to many of the Gondwanan continents of the southern hemisphere, including multiple expeditions to Madagascar and Africa where he has worked on bizarre crocodiles and giant sauropod dinosaurs. Closer to home in the Rocky Mountain West, his research is focused on the ecology and evolution of dinosaurs during the last 20 million years of the Cretaceous. In addition to investigations into the latest-Cretaceous dinosaurs of Colorado, he leads the Laramidia Project, currently working to uncover dinosaur ecosystems in the Cretaceous of Grand Staircase-Escalante National Monument, Utah, northwestern New Mexico, and the Big Bend region of Texas.