Dr. Thomas R. Holtz, Jr., is recognized as one of the world's leading dinosaur phylogeneticists (specialist in reconstructing dinosaur family trees), and experts on tyrannosaurs. In addition to his many scientific papers, he has been involved as a consultant and on-air talent for documentaries in the US, UK, Canada, and Japan, including the award-winning Walking with Dinosaurs and When Dinosaurs Roamed America for the BBC and the Discovery Channel. He is the creator and director of the Earth, Life, and Time Program at the University of Maryland, College Park, where he received the Outstanding Faculty Award from the University Honors Program in 1997, and the 2003 Celebrating Teachers Award from the Center for Teaching Excellence, and is a widely quoted news source for international science journalism. Dr. Michael Brett-Surman is a noted paleontologist and is currently serving as the Museum Specialist for Dinosaurs, Fossil Reptiles, and Amphibians at the National Museum of Natural History of the Smithsonian Institution. He also coteaches a K-12 geoscience teacher field series of three courses in geology and paleontology through the Bighorn Basin Geoscience Center, which is part of the Smithsonian Outreach program. He is the author of The Jurassic World Field Guide to Dinosaurs with Dr. Thomas R. Holtz, Jr., and the coeditor of The Complete Dinosaur, second edition. Robert Walters is a graduate of Pennsylvania Academy of the Fine Arts in Philadelphia and is a professional artist specializing in paleontology. His artwork can be seen on display at the Smithsonian Institution National Museum of Natural History. He has illustrated more than 20 dinosaur books and numerous magazines, and also works on television productions for PBS and the Discovery Channel. He was the art editor for The Complete Dinosaur from Indiana University Press and contributed illustrations to Dino Finds for the National Geographic Society and Jurassic World Dinosaur Field Guide.