Gillette, David D.

David D. Gillette, Ph.D., is the coeditor of "Dinosaur Tracks and Traces" and coauthor of "Glyptodonts of North America."

Mark Hallett is a well-known illustrator of prehistoric animals and their environments. His work has graced the pages of "Life, Smithsonian," and "Natural History" and has been featured in internationally televised programs.