 Afterwards, he served as a voluntary assistant to Günther Beck von Mannagetta und Lerchenau at the Naturhistorisches Museum in Vienna, where he later attained the titles of assistant curator (from 1897), curator (from 1899) and head curator (from 1912).From 1918 until his retirement in 1922, he was director of the museum's botany department.In retirement, he continued his studies in the field of lichenology.