Every year millions of museum visitors marvel at the skeletons of dinosaurs discovered by John Bell Hatcher (1861-1904), whose life is every bit as fascinating as the bones and fossils he unearthed. Hatcher helped discover such iconic creatures as the Triceratops and Diplodocus, and—refusing to restrict his talents to dinosaurs—he also found the first significant sample of mammal teeth from our relatives that lived 66 million years ago, filling a key gap in humanity's own evolutionary history. Nearly 125 years after Hatcher's monumental "hunts" ended, paleontologist Lowell Dingus invites us to marvel at this real-life Indiana Jones and the vital role he played in our understanding of the prehistoric past.