It has been almost 40 years since Emmanuel Le Roy Ladurie published an English translation of his (at the time) deeply unsettling essay, “Motionless History,” in the second issue of Social Science History (SSH, Winter 1977). For many historians, whose livelihoods depended on narrating the “march of history,” his claim that long periods of history were characterized by a distinct absence of change—his example was Europe from late antiquity up to the early eighteenth century—was nothing short of heretical. The newly established SSH was, however, an entirely logical place from which to launch this fusillade against the disciplinary norms of the Anglo-American historical profession, as the journal was the product of a contra-establishment project, the Social Science History Association (SSHA). Founded in 1974 and hosting its first annual conference in Philadelphia in the fall of 1976, the SSHA emerged out of the more general social and political ferment of that period. Its organizers had the specific intention to disrupt (to use our word and not theirs) what they thought were the rigid practices and limited vision of the then American Historical Association. In so doing they hoped to make space for a new kind of historical enquiry that had much to learn from the social sciences, and hoped to teach them something in return. They were joined in that enthusiastic moment by historically minded rebels from the American Sociological Association, as well as small numbers of anthropologists, demographers, economists, geographers, and political scientists who were all eager to incorporate both historical context and a theoretical appreciation of contingency into their work. In the intervening years since that hopeful beginning, many have argued that the anticipated interdisciplinary exchange failed in one way or another. But let me not get ahead of myself.