 He completed his studies in 1991 with the authority to teach history.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 1991 to 1992, a research period took him to the German Historical Institute London and the London School of Economics.