These and other early works provided both an impetus and a foundation for later historical studies, but over the last two decades a profound transformation has taken place as historians of science have begun to integrate the history of paleoanthropology and prehistoric archeology into the history of science more generally. By situating the history of paleoanthropology within the context of developments in the other natural sciences, and more broadly within the emergence of science as a Western intellectual institution, scholars have come to recognize the complex and sometimes unexpected scientific, philosophical, and social roots of anthropological theories and discoveries. In this article I cannot hope to relate the details of this history; instead I mean to show how our broad understanding of the history of paleoanthropology has changed as a result of recent work in the history, philosophy, and sociology of science by outlining the major trends of that history as it has been reinterpreted. I will then refer the reader to recent scholarly sources that can be read to fill in the details of this complex history.Research into the history of paleoanthropology has been justified in numerous ways. However, it has also been asked how useful it really is for practicing scientists to know the history of their discipline. 1 This article proceeds from the view that a knowledge of how present and past theories were formulated, how and why significant discoveries were made, and why scientists accepted or rejected certain ideas has more than merely pedagogical value. Contemporary theories and debates are almost always the product of innumerable previously held theories, beliefs, and assumptions, all of which were shaped by ever-changing social and intellectual conditions and a steady stream of new discoveries, all of which had to be interpreted by the means available at the time. Modern paleoanthropology is a complex amalgam of all these factors. Hence, it is only through a more complete investigation of their interactions that we will be able to understand how modern research on human origins has emerged as a scientific discipline.This article cannot present a detailed history of paleoanthropology, nor is that its intent. Rather, it seeks to trace the broad steps by which speculations about, and the study of human origins became a scientific endeavor. It will be necessary to take a long chronological view of this process because some of its most critical conceptual and methodological developments occurred very early. While it may be argued that the modern science of paleoanthropology has its origin in the nineteenth century, the birth of a rational and naturalistic inquiry into human origins began much earlier. Indeed, the first steps toward a truly scientific inquiry into our origin and earliest history began with the first Greek philosophers. The principles, theories, and debates they established not only form the foundation on which modern paleoanthropology is based, but remain at the core of all contemporary theories and...