I am a Paleolithic archaeologist interested in human behavioral ecology and the evolution of so-called modern human behavior. Many of the behavioral features that distinguish us as a species evolved not as a single, tightly-integrated package, but as mosaic of semi-autonomous systems–technology, mobility and foraging strategies, social organization and complex symbolic behavior. At a theoretical level, I am interested in how each of these systems are organized and why they respond as they do to different sets of ecological constraints and selective pressures. My methodological interests center on agent-based simulation modeling as a tool for developing hypotheses that may be tested against the archaeological record. I lead the Tibet Paleolithic Project, which is concerned with understanding Pleistocene hunter-gatherer colonization of the Tibetan Plateau.