Prof. Yohanan Bar Yafe Szemiñski (Jan Szemiñski) is an Ethno-historian, specialized in Andean (Inca) oral tradition, history of the Inca Empire, and colonial history of the Inca. His current research includes the geographical limits of the Inca world, the use of Andean languages as a historical source for cultural changes from the 15th to the 20th century, and the construction of a colonial Quechua database (at the present it includes 102,000 items).