He has a PhD in Jewish studies from Lund University (no relation). He has published widely on comics in books and journals, academic and popular. Recent publications include Re-Constructing the Man of Steel: Superman 1938–1941, Jewish American History, and the Invention of the Jewish–Comics Connection (Palgrave 2016) and Muslim Superheroes: Comics, Islam, and Representation (co-edited with A. David Lewis, ILEX Foundation/Harvard University Press, 2017).