History can help make us aware of patterns in our thinking about the world, of prejudices and habits of thought. In a lecture on April 20, 2023, sponsored by the Jewish Studies Program, David Nirenberg, the director and Leon Levy Professor at the Institute for Advanced Study (IAS) in Princeton, NJ, drew upon the long history of anti-semitism in order to ask how that history can help us understand debates about anti-semitism today.