to join his archaeological expedition. In 1882, Dörpfeld together with a team of archeologists joined Schliemann, who was then excavating Troy. The two eventually became good friends and continued their collaboration on other projects as well. They excavated in Tiryns, from 1884 to 1885, and at Troy again from 1888 to 1890. Dörpfeld also excavated at the Acropolis of Athens from 1885 to 1890, where he unearthed the Hekatompedon temple (the pre-Classical Parthenon). He continued excavations at Pergamon (1900–1913, with Alexander Conze) and in 1931 in the Agora of Athens. In 1886, Dörpfeld founded the German School of Athens, which was later named after him, as the Dörpfeld Gymnasium. From 1887 to 1912, he was the director of the German Archaeological Institute at Athens. He published, in 1896, Das griechische Theater, the first study of Greek theatre construction. After his retirement in 1912, Dörpfeld engaged in numerous academic debates on different archaeological topics. For example, in the mid-1930s, he took part in a celebrated debate with American archaeologist William Bell Dinsmoor on the nature of configuration of the three phases of the Parthenon. At the beginning of the 1920s, he started to lecture at the University of Jena but was not satisfied with teaching as a profession and so returned to Greece. In 1913 Döperfield became a signatary of the Manifesto of the Ninety-Three, a manifesto in which 93 prominent academic figures in Germany endorsed the early German military action of World War 1. It is to be noted that many of the signatories would later express regret in the signing of said document. Dörpfeld died in 1940 on the island of Lefkada, Greece, where he had a house, believing that the bay of Nidri on the eastern coast of Lefkada was the historical Ithaca, home of Odysseus in Homer's Odyssey. Work He developed a method of dating archaeological sites by the strata in which objects were found and the type of materials used for the buildings. He corrected many of Schliemann's previous conclusions, including the shaft burial sites at Mycenae. Dörpfeld realized that the site was a "tholos" tomb, not the "Treasury of Atreus", as Schliemann claimed. During the excavations of Panagiotis Kavvadias on the Acropolis of Athens, Dörpfeld was instrumental in correcting the previous belief that the temple of Athena, destroyed by the Persians in 480 BCE, was not beneath the Parthenon but to the north of it.