Gary Haynes, archeologist and author of two related books, Mammoths, Mastodonts, and Elephants (Cambridge University Press, 1993) and The Early Settlement of North America: The Clovis Era (Cambridge University Press, 2002). He has spent nearly 30 years working in actualistic studies of large-mammal bones in Africa, Australia, and North America, and has also been deeply involved in Paleoindian research for even longer.