 Initially, he worked as a research assistant on the inventory and evaluation of the trial records of the , and since 2012 he has been head of the archive.Since 2006, Jörn has been a member of the board of the and the .and since 2008 member of the board of the , also a member of the , founding president of the David Mevius Society and member of the board of the Association of Friends and Sponsors of the Archive of the Hanseatic City of Wismar.