Born in Aomori Prefecture in 1975. Nagaoka obtained a master’s degree from the Graduate School of Science, Kyoto University, and holds a doctorate in Medical Science. He is currently a professor at Aomori Public University, previously serving as an associate professor at St. Marianna University School of Medicine. Specializing in anthropology and anatomy, he conducts research in Peru and Japan. His main research themes concern the clarification of processes of social complexification and origins of conflict in ancient Andean societies. In recent years, he has been engaged in research on processes of human societal formational and human lifestyles, conducting archaeological excavations and surveys of ancient human remains in the ruins of Andean civilizations.