David Fastovsky is Professor of Geology at the University of Rhode Island and tutor at the Universidad Nacional Autónoma de México. His interest in dinosaurs started as a child when he read about a 1920's fossil collector's adventures in the Gobi Desert. Dinosaurs won out years later when he had the tough decision of choosing between a career in music (he takes his viola on his many field trips) or paleontology, and he has had many of his own adventures in far-flung parts of the world. He's known as a dynamic teacher as well as a respected researcher with a focus on the environments in which dinosaurs roamed. When dinosaur fossils are found he's called on to reconstruct the place where they lived. He has made several television documentary appearances, and was presented with the Distinguished Service Award by the Geological Society of America in 2006.

David B. Weishampel is professor in the Center for Functional Anatomy and Evolution at The Johns Hopkins University. His research focuses on dinosaur evolution and how dinosaurs function and he is particularly interested in herbivorous dinosaurs and the dinosaur record of Europe. Among his many publications he is senior editor of The Dinosauria, and has contributed to a number of popular publications including acting as consultant to Michael Crichton in the writing of The Lost World, the inspiration for Steven Spielberg's film Jurassic Park.