In 1948, he began apprenticeship in Potsdam with organ builder Alexander Schuke. He and his family moved on from 1961 to Switzerland, West Berlin and Regensburg. There he took over the workshop of the long-established organ builder Eduard Hirnschrodt in the Regensburg district of Stadtamhof in 1974.
The first work in the new workshop was an organ in 1975 for the community of Etzelwang.
A short time later, the company received the first orders for a three-manual organ with 40 registers. In 1980 the first four-manual organ for the Church of Saint Joseph in Memmingen was completed with 52 registers.
Later, the workshop was relocated to south of Allkofen near Regensburg in Bavaria. Until 1995, Georg Jann ran his company under the name "Georg Jann Orgelbau Meisterbetrieb".