Marc A. Krell analyzes the theologies of four twentieth-century Jewish thinkers - Hans Joachim Schoeps, Franz Rosenzweig, Richard Rubenstein, and Irving Greenberg - who have constructed theologies based on their interaction with Christian thought and culture. Their work reflects a common attempt to understand the impact of Christian culture on the historical events prior to and following the Holocaust, and to re-evaluate the relationship between the two religions in light of a history of theological anti-Judaism and modern, racial antisemitism. Krell argues that in their attempts to clarify Jewish identity in relation to Christianity, these thinkers reveal that the boundaries between the two faiths have always been blurred. The writing of these theologians illustrates a historical pattern in which Jewish theologies emerge out of a religious and cultural interchange with Christianity.