Gottsched taught him at the University of Leipzig. Rousseau was a great friend, until Grimm (whom he’d introduced) became his companion d’Épinay’s lover. The friendship with Rousseau led to an association with Diderot, d’Alembert and the other encyclopaedists; Diderot became his most intimate friend, and Grimm became one of the mainstays of d’Holbach’s intellectual and libertarian côterie. Grimm described Garrick as the only actor to meet the demands of the imagination, and arranged concerts and society introductions for Mozart when the young prodigy, his father and sister arrived in Paris.