Daniel Zajfman was born in Brussels, Belgium. He joined the Hashomer Hatzair movement while studying at the Athénée Robert Catteau. In 1979 he emigrated to Israel where he met his wife, Joëlle Hayoun. In 1983 he graduated in Physics (B.Sc.), at the Technion, Israel Institute of Technology, Haifa. He continued his studies at the Technion and in 1989 received his PhD, in atomic physics. He conducted his post-doctoral at the Argonne National Laboratory, Illinois, United States. (1989–1991)