Anthony J. Martin is teaching professor in the Department of Environmental Sciences at Emory University, where he has taught classes in geology, paleontology, and environmental sciences for more than thirty years. He has a PhD in geology and his research specialty is ichnology, the study of modern and ancient traces caused by animal behavior, such as tracks, burrows, and borings. He is the author of numerous books, including Dinosaurs Without Bones, The Evolution Underground, and Tracking the Golden Isles.