He was appointed to the chair of mathematics at Halle in 1810 and in 1812, on the death of Klügel, he took on the directorship of the University Observatory too.
Siya ay hihirangin upang angkinin ang upuan ng matematika at Halle sa 1810 at sa 1812, sa kamatayan ng Klügel, siya kinuha sa patnugot ng University obserbatoryo masyadong.