He participated in excavations in Alzey, under the direction of Wilhelm Unverzagt, in the Kerameikos in Athens ( Dieter Oly and Gottfried Gruben ), in Persia ( Heinz Luschey ), Bithynia and in Commagene (Friedrich Karl Dörner).
In 1965 to 1966, he was a year travel scholarship of the German Archaeological Institute (DAI).
In 1988, he was appointed Professor of Ancient Architectural History, at the Free University Berlin.
He led excavations for ordinary members of the DAI to Greece and Asia Minor.
He headed the excavations in Kassope, with Ernst-Ludwig Schwandner, Sotiris Dakaris and K. Gravani .