This volume, published in honor of the occasion of David Pilbeam's 65th birthday, covers major topics in human, primate, and mammalian evolution, mostly from the Miocene to the present. The papers emphasize novel interpretations of several key areas of longstanding interest and importance, including Miocene biogeography and hominoid evolution, the origins of hominids, and new interpretations of the hominid fossil record. In terms of content, most of the papers tackle key issues in the evolution of hominoids and hominids in terms of systematic paleoenvironmental and behavioral questions. More broadly, however, the papers explore the epistemological problems of how one interprets the past from the available data.