Beginning in 1886 he studied under Albrecht Bräuer at the Staatliche Akademie für Kunst und Kunstgewerbe Breslau.
His first designs date from 1893: vases, glass windows, book covers, later furniture, theatrical sets, and interior decorations.
The promotional poster for the sixth war bond (sechste Kriegsanleihe) was adorned with his painting Helft uns siegen!
[2] A soldier, his face darkened from the muck of the trenches, gazes beyond the viewer into No Man's Land with eyes that shine as if from an inward light.
[2] During the National Socialist period Erler's portraits of Adolf Hitler, Franz von Epp, and Wilhelm Frick were very remunerative.