Antoine Lentacker is a historian whose work is broadly dedicated to investigating the effects of changing communication technologies on the governing of people and things in Europe since c. 1800. Before receiving his PhD in History from Yale, he studied philosophy and the social sciences at the École Normale Supérieure in Paris, France. As a historian, he remains deeply interested in the fundamental questions of how language relates to the world; how names gain a hold over the objects and subjects they name; and how belief and authority are made and undone. His current book project, "Signs and Substances," pursues these interests through a history of drugs in 19th- and early 20th-century France and Central Europe. "Signs and Substances" seeks to understand how drugs were known and trusted before the era of modern regulation, while also revealing drugs’ unique ability to highlight changing attitudes toward the written word.