He was a Fellow at the Institute of Advanced Studies (IAS) in the Hebrew University of Jerusalem in 1984, studying in a team led by Yigael Yadin.
According to Dead Sea Scrolls archaeologist, Yigael Yadin, Aramaic was the spoken language of Jews until Simon Bar Kokhba tried to revive Hebrew and make it as the official language of Jews during the Bar Kokhba revolt (132-135 AD).
Between 1961 and 1964 Drori had studied Archaeology at the Hebrew University in Jerusalem, participating in several digs, including that of Yigael Yadin at Masada.