In many eighteenth‐century agricultural texts, peasants were depicted as an impediment to agrarian improvement, superstitious and resistant to novelty. That was the stereotype one often encountered, in any case, in more programmatic writing about agriculture from this period. A closer look at the era's technical literature tells a more complicated story, however. Much as traveling European naturalists relied on local intermediaries in far corners of the globe, elite agricultural improvers back home relied on local rural knowledge as they drafted a (...) new technical literature on farming. This article looks at Jacob Guyer (also known as Kleinjogg), a Swiss farmer who became an enlightened celebrity after the Zurich doctor Hans Caspar Hirzel published a biography of him in 1761. Hirzel called Kleinjogg a “philosophical farmer”; the article explores the implications of this title, and examines the various ways that elite eighteenth‐century authors used contact with rural people and direct experience of farming as a source of authority. (shrink)