As my second subject of study (alongside history) was Protestant religious education, I have been particularly interested in dealing with questions of church history (albeit from a profane historical perspective) over the last ten years. This also resulted in the choice of topic for my habilitation project, which focussed on milieu formation processes in north-west German Protestantism between the middle of the 19th century and the First World War. In addition to this (and partly related to this), I also worked very intensively on Bremen's church history, which is very interesting for historians.

• Dietmar von Reeken (ed.): Unser Lieben Frauen. The history of Bremen's oldest parish from its beginnings to the present day, Bremen: Edition Temmen 2002, therein:
• Dietmar von Reeken: The parish of Unser Lieben Frauen in the 19th and 20th centuries, pp. 83-183
  
• Dietmar von Reeken: From the "God's box" to social welfare. 475 years of Liebfrauendiakonie in Bremen, Bremen: Edition Temmen 2000
• Dietmar von Reeken: Churches in the transition to modernity. Milieubildungsprozesse im nordwestdeutschen Protestantismus 1849 - 1914, Gütersloh: Kaiser, Gütersloher Verl.-Haus 1999 (= Religiöse Kulturen der Moderne, Bd. 9)
• Dietmar von Reeken: Family, religion and capitalism: The Bremen textile entrepreneur family Lahusen 1816-1933, in: Niedersächsisches Jahrbuch für Landesgeschichte 71(1999), pp. 223-234
• Dietmar von Reeken: Lahusen - Eine Bremer Unternehmerdynastie 1816-1933, Bremen: Edition Temmen 1996 (despite the title of the book, this study also deals to a large extent with questions of church history because of the great importance of religion for this family)
• Dietmar von Reeken: Protestant milieu and "liberal" regional church? Milieu formation processes in Oldenburg 1849 - 1914, in: Olaf Blaschke, Frank-Michael Kuhlemann (eds.), Religion im Kaiserreich. Milieus, Mentalitäten, Krisen, Gütersloh: Kaiser, Gütersloher Verl.-Haus 1996, pp. 290-315