In the same year he was awarded a degree in art history by Heinrich Lützeler with a thesis on "French architectural theory of the 17th century"[1] to the Dr.
[2] After graduating, he first moved to the administration[3] of the Technische Universität Dortmund and then entered the service of the Landesamt für Denkmalpflege Bremen [de] as a scientific officer in 1973.
[2] Its director at the time, Udo Mainzer, entrusted Brönner with basic research on 19th and 20th century architecture after his arrival and 20th century,[4] for which a new department within the inventory was established[3] and thus initiated the creation of the standard work on villa architecture in Germany: Die bürgerliche Villa in Deutschland 1830 - 1900.
[1] In addition to his official duties, Brönner has acted as editorial director of the biannual journal Die Denkmalpflege [de] since 1993.
[1] In addition to other memberships in scientific advisory boards, including those for Speyer Cathedral and Mainz Cathedral[2] Brönner was also involved in the preparations for the inclusion of the Rhine Gorge in the List of World Heritage Sites in Germany in 2002 via the State Office for the Preservation of Historical Monuments and Rhineland-Palatinate.