Having previously struggled to fit into Israeli academia without success, perhaps due to a combination of personal and political reasons,[17] Netanyahu nonetheless continued his academic activities upon his return to Israel. Though he still was not able to become a member of the academic faculty of the Hebrew University, his mentor Joseph Klausner recommended him to be one of the editors of the “Encyclopaedia Hebraica” in Hebrew; and upon Klausner's death, Netanyahu became chief editor, in tandem with professor Yeshayahu Leibowitz.