Career
He concentrated on harvestmen, where he described almost a third (2,260) of today"s known species, but also almost 700 taxa of spiders and numerous Solifugae. From 1933 on, he was the second director of the Übersee-Museum in Bremen, Germany. The Senckenbergische Naturforschende Gesellschaft bought his extensive collection (including type material from other arachnologists such as L Koch, Eugène Simon, Thorell, Philipp Bertkau and Friedrich Dahl) and his private library.
Some of his specimens are also in the Museum für Naturkunde Berlin.
