Grave became professor at Kharkov in 1897 and, from 1902, he was appointed professor at the University of Kiev, where he remained for the rest of his life.
Libingan ay naging propesor sa Kharkov sa 1897, at mula 1902, siya ay hihirangin propesor sa University of Kiev, kung saan siya ay nanatili para sa natitirang bahagi ng kanyang buhay.