The Judges’ citation: Joel Isaac’s Working Knowledge is a truly impressive and original book. Tackling some of the most important epistemological controversies of the twentieth century by focusing on academic work undertaken in between the established disciplines at Harvard, Isaac systematically deconstructs a widely accepted teleological narrative, replacing a more conventional and disembodied story of texts and theses by one with the people and contexts put back. The methodology is both sophisticated and convincing. The book is well written and despite the complexity of the subject matter accessible to the non-specialist reader. It will be of interest also to historians who might not otherwise concern themselves with this particular chapter of intellectual history, not least because the story it tells is itself one about history in practice.