In a 1779 letter, Immanuel Kant congratulates his former student Marcus Herz on the success of philosophical lectures held in his own home, on achieving, as Kant puts it, “durchgängiges Ansehen … im berlinischen Publico.” Herz was one of Kant's favorite pupils and even served as a respondent at his second dissertation disputation in 1770, a rarity for a Jewish student. Alongside a prominent medical career in Berlin, Herz held lectures on experimental science, electricity, and philosophy, the latter based on his study with Kant. Enjoying renown amongst audiences mixed in gender and social position, Herz made the most of demographic opportunities rarer in provincial Königsberg. Here, Kant is nonetheless somewhat unsure about Herz's success in this urban setting: