Jürgen Isenberg won at the Junior World Championships 1989 in Voss with Johannes Hackl , Holger Schönthier and Frank Isenberg in the relay race behind the relay from the Soviet Union and in front of the representation from the GDR the silver medal. In 1990, in Sodankylä, with Hackl, Martin Rossberger and Jürgen Wallner, the bronze medal was added behind the GDR and the Soviet Union. Isenberg was particularly successful in Galyatető in 1991 , where he won the title in the sprint and with Peter Sendel , Markus Quappig and Carsten Heymann in the relay. After switching to the adult sector, Isenberg did not make the big breakthrough, but was still able to achieve some successes. At the second biathlon European Cup in the 1989/90 season , he won the overall standings ahead of Quappig and Rossberger.
Germany
