Ph. D., Tel Aviv University, 1974. Head of the Weizmann Institute on Zionist Research, Tel Aviv University, 1978-1982. Since 1985 Professor, Department of Jewish History, Tel Aviv University. Since 1996, Ruben Merenfeld Chair on the Study of Zionism, Tel Aviv University. Founder and first head of the Yitzhak Rabin Center for Israel Studies, Tel Aviv, 1996-1999.

Publications include: Berl Katznelson. A Biography of a Socialist Zionist (1984), Land and Power. The Zionist Resort to Force, 1881-1948 (1992), Historiography and politics: The Debate of the New Historians, History and Memory, No. 1, 1995, co-ed., Essential Papers on Zionism (1996), Ben Gurion and the Bible: The Forging of a Historical Narrative?, Middle Eastern Studies, No. 4, 1997, The Holocaust and World War II as Elements of the Yishuv Psyche until 1948 in Alvin H. Rosenfeld, ed., Thinking About the Holocaust (1997).