In his thesis he examined the archaeological , architectural and material remains of a medieval parish in the western Rhineland ( Lohn , Eschweiler , Northrhine - Westphalia ) .
In 1999 Recker finished his doctoral thesis at the University of Bonn .
In Recker 's thesis Recker examined the archaeological , architectural and material remains of a medieval parish in the western Rhineland ( Lohn , Eschweiler , Northrhine - Westphalia ) .
In 1999 Recker finished his doctoral thesis at the University of Bonn .