This newest annual edition of Osiris brings together a variety of scholars to consider a topic of increasing interest in the history of science: expertise. Focusing specifically on the role expertise has played in the support, legitimation, and growth of the state since early modern times, Expertise and the Early Modern State reveals how scientific expertise and practical knowledge were crucial to the construction of early modern empires and economies. The state, on the other hand, performed a similar function for scientists, giving them much of the status and resources they needed to further their work. A penetrating, multifaceted investigation, Osiris 25 will be required reading for historians of science and early modern political development.