Siegfried Kracauer has been misunderstood as a naive realist, appreciated as an astute critic of early German film, and noticed as the interesting exile who exchanged letters with Erwin Panofsky. But he is most widely thought of as the odd uncle of famed Frankfurt School critical theorists Jurgen Habermas, Theodor Adorno, Walter Benjamin, and Max Horkheimer. Recently, however, scholars have rediscovered in Kracauer's writings a philosopher, sociologist, and film theorist important beyond his associations--and perhaps one of the most significant cultural critics of the twentieth century....