 A trip to Rome in 1857 introduced him to the circle of scholars at the Deutsches Archäologisches Institut (The German Archaeological Institute), on whose fellowship he travelled to Greece with Alexander Conze in 1859-60, On his return to Germany he taught briefly at Greifswald and at Tübingen, 1862-67.In 1872, following the publication of his monograph on the Parthenon he accepted the chair for Classical Archaeology at the recently established University of Strasbourg, where he settled down for life and created a great department of archaeology supported by a great archaeological library and a vast cast collection.During recesses he scoured the collections of classical sculpture conserved in English country houses, the result of a century and a half of British collecting; in 1882 he published the repertory for which he has remained famous, a work still referred to, "Ancient Marbles in Great Britain"; this, in addition to his scholarly work on classical sculpture, is the cornerstone of the history of English collecting in the eighteenth and nineteenth centuries.