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- Matt Lamanna, Mary R. Dawson Associate Curator and Head of Vertebrate Paleontology, Carnegie Museum of Natural History - Lance Grande, Negaunee Distinguished Service Curator of the Field Museum, Author of Curators: Behind the Scenes of Natural History Museums - Dr. Patrick O'Connor, Professor, Paleontologist, and National Geographic Explorer, College of Medicine, Ohio University, USA - Julia Clarke, J. A. Wilson Professor in Vertebrate Paleontology, Jackson School of Geosciences at the University of Texas at Austin As much as two hundred and fifty-three million years ago, the most incredible beasts roamed this earth. They ruled supreme on the land, under the water, and in the air for some one hundred million years before their time came to an end.