He has been involved in the primary paleontological descriptions of a number of Middle and Late Pleistocene human remains, of both archaic and early modern humans. The first project was his monograph on the Shanidar Neandertals from Iraqi Kurdistan. Subsequent major projects concerned with early modern humans include the Abrigo do Lagar Velho (Portugal) Dolní Věstonice and Pavlov Moravia, Czech Republic, Peştera cu Oase (Romania), Peştera Muierii (Romania), Mladeč (Czech Republic), Tianyuandong (China), and Sunghir (Russia). Additional Neandertal descriptions include those from Krapina (Croatia), Oliveira (Portugal), Kiik-Koba (Crimea), and Sima de las Palomas (Spain). To these can be added Middle Pleistocene human remains from Aubesier (France), Broken Hill (Zambia) and Hualongdong (China), plus late archaic humans remains from Xujiayao and Xuchang (China). These paleontological descriptions include both primary data on these fossils and a diversity of paleobiological interpretations of the remains and the Pleistocene human groups from which they derive.