Justyna Olko Justyna Olko is a professor at the Faculty of “Artes Liberales” at the University of Warsaw and director of its Center for Research and Practice in Cultural Continuity. She specializes in Nahua ethnohistory, anthropology, and linguistics as well as cross-cultural transfer between indigenous and European worlds. She is also the author of Insignia of Rank in the Nahua World. John Sullivan is professor of Nahua language and culture at the Universidad Autonoma de Zacatecas, visiting professor at the University of Warsaw’s Center for Research and Practice in Cultural Continuity, and director of the Instituto de Docencia e Investigación Etnológica de Zacatecas, A.C. He is a Guggenheim Fellowship recipient and works with indigenous students monolingually on teaching, research, and revitalization projects. Jan Szemiński is professor emeritus at the Department of Spanish and Latin American Studies, Faculty of Humanities, at the Hebrew University of Jerusalem. He is an ethnohistorian interested in Inca ethnohistory, oral tradition, and Quechua language as a historical source in the sixth- to eighteenth-century central Andes.