Johannes Braun (1628-1708) was professor of theology and Hebrew at the university of Groningen. A disciple of Coccejus in theology, he adhered to Cartesianism in philosophical matters. He published scholarly, didactic and polemic writings. Among his correspondents was Leibniz. He knew at least some of Spinoza's works, and rejected the latter's alleged atheism. Descartes's influence is pervasive, though as a philosopher Braun was rather superficial. For him, Cartesian ism was a tool in a rationalist approach to cheology and (particularly) in demarcating theology from philosophy. In this respect, his position is exemplary for the adaptations taking place in institutional philosophy around 1700.