Yonathan was born and raised in Haifa, the son of immigrants from France. After high school he studied at Yeshivat Maale Gilboa before going on to serve in the elite IDF 8200 intelligence unit. He has a law degree and an M.B.A. with honors, both from the Hebrew University of Jerusalem. After passing the bar exam, he spent several years in public service, including as head of the legislative division of the investment section at the Israel Securities Authority and later as chief of staff to the chairman of the Electricity Authority. In 2015 Yonathan was appointed CEO of Nativ, the national center for conversion and identity. Nativ's goal is to serve as a solution for hundreds of thousands of Israeli citizens who are not recognized as Halachic Jews, by using a pluralistic approach to connect them to their Jewish identity. Yet Yonathan felt that the organization was not reaching anything like a significant percentage of their target population. He therefore took the organization in an innovative direction, using an advanced digital network to reach out to potential participants and generate a sincere and personal relationship with them. The results of this process have been unprecedented, with the number of Nativ students almost doubling and proving that it is possible to get diverse and wide ranging populations to be interested in engaging with their Jewish identity.