 In his 1899 doctoral dissertation "Über die kleinste Kugel, die eine räumliche Figur einschließt" under Schottky he proved the eponymous Jung's Theorem.In 1902 he completed his Habilitation thesis in Marburg and remained there until 1908 as a privatdocent.Afterwards he was a Studienrat (teacher at a secondary school, "i.e.