Koller worked for the Natural History Museum in Vienna starting in 1933.

In 1936, the Smithsonian's Anthropological Department commissioned a series of "family portrait-sculptures of ancient Austrians.

They used prehistoric skulls to model scientifically accurate heads for exhibition in an early example of forensic facial reconstruction.

[2][3] Koller published a paper in 1935, Ein Beitrag zur Schädelkunde der Juden (Skull science of the Jews), which was a craniologic study of the Jewish population of Constantinople.

[citation needed] Koller worked for the Natural History Museum where she created a historical bust of St. Leopold which was exhibited at the 500th anniversary of his canonization.