Subsequently, he stayed at the University Greifswald to complete a research study under the supervision of Horst Wernicke on the subject "The Hanseatic Stalhof in London in the period from 1474 to 1554".
From 1994 until his doctorate in 1996, he worked as a research assistant on the joint project "The Hanseatic Flemish Trade" at the Universities of Greifswald and Kiel.
From 1996 to 1999 he worked on the joint project "The Integration of the Southern Baltic Sea Region into the Old Reich 1555-1806" of the Universities of Greifswald, Kiel and Augsburg.
The following two years until 2001 he worked on the project "Judicial activity, personnel structures and politically relevant jurisdiction at the Wismar Tribunal 1653-1806" at the Chair of General History of the Modern Era at the University of Greifswald, funded by the Fritz Thyssen Foundation.
Initially, he worked as a research assistant on the inventory and evaluation of the trial records of the Wismar Tribunal [de], and since 2012 he has been head of the archive.