Wilhelm von Humboldt (1767-1835), an early pioneer in the philosophy of language, linguistic and educational theory, was not only one of the first European linguists to identify human language as a rule-governed system -the foundational premise of Noam Chomsky's generative theory - or to reflect on cognition in studying language; he was also a major scholar of Indigenous American languages. However, with his famous naturalist brother Alexander 'stealing the show, ' Humboldt's contributions to linguistics and anthropology have remained understudied in English until today. Drechsel's unique book addresses this gap by uncovering and examining Humboldt's influences on diverse issues in nineteenth-century American linguistics, from Peter S. Duponceau to the early Boasians, including Edward Sapir. This study shows how Humboldt's ideas have shaped the field in multiple ways. Shining a light on one of the early innovators of linguistics, it is essential reading for anyone interested in the history of the field.