Rhys Charles is a paleontologist, science communicator, and head of the Bristol Dinosaur Project, where he works with researchers, schools, and community groups to introduce paleontology to the public. His popular science books include Frozen in Time: Fossils of the United Kingdom and Where to Find Them. He has also worked as the lead paleontological consultant for large-scale events featuring full-sized animatronic and LEGO dinosaurs. Tugce Okay is a natural history illustrator who works primarily with watercolors. Her work has appeared in many books and magazines.