Monge was something of a protégé of Bossut’s. Condorcet and d’Alembert encouraged him to submit research papers to the Académie des Sciences. He taught Malus and Hachette as well as Fourier, who described him as very learned, and having a loud voice. Berthollet, an intimate friend, accompanied him on Bonaparte’s expedition to Egypte, where with Malus and Fourier he became a member of the Institut d’Égypte. Monge collaborated with Lavoisier, and visited his friend Lagrange when the latter was dying.