He took part in the excavations at Olympia in 1878, became an assistant in the Berlin Museum in 1880, and professor at Berlin (1884) and later at Munich.
Excavations were made on its site in 1811 by Baron Haller von Hallerstein and the English architect C. R.
The many important objects found in these excavations are preserved in the local museum.
Numerous objects had been discovered in the course of excavations, but not one of them could be recognized as more than a few centuries old, while those that were not demonstrably foreign imports were of African type.
Excavations on the site of Ostia were only begun towards the close of the 18th century, and no systematic work was done until 1854, when under Pius IX.