After completing his studies at the University of Göttingen Range began his career with the judiciary of Lower Saxony, serving as a judge from 1975-78, as a prosecutor from 1978-86 and as a senior prosecutor at the Higher Regional Court in Celle from 1986-89.
From 1989-2001 Range held various roles within the , including as the leader of the Criminal Law, Law of Criminal Proceedings, and Clemency Unit.