He teaches about the history of Zionism, Palestine, Israel, Jerusalem, and the Arab-Jewish encounter. His first book, Defining Neighbors: Religion, Race, and the Early Zionist-Arab Encounter (Princeton University Press, 2014), investigated the mutual perceptions of Zionists and Arabs in the late nineteenth and early twentieth centuries, showing the prominent place of religious and racial categories in the ways in which these communities imagined and related to one another. His current research focuses on post-1967 Palestinian nationalist interpretations of Judaism and Zionism. Gribetz earned a PhD in History from Columbia University, an MSt in Modern Jewish Studies from Oxford University, and an AB in Social Studies from Harvard University.