[1] In 1931 he joined the Bavarian State Collection of Zoology (Zoologische Staatssammlung München) as an assistant curator of ichthyology, to work on the specimens collected by the III German Grand Chaco Expedition to East Paraguay.
[4] He also obtained specimens from Vienna as part of his efforts to rebuild the ZSM collection.
[2] He returned to South America in 1953-54, travelling to Bolivia with Walter Forster; during this expedition Schindler was appointed to negotiate the fishing quotas on Lake Titicaca with Peru by the Bolivian Ministry of Agriculture; the Peruvian negotiator was another German, Hans Wilhem Koepcke.
He collected many specimens from Lake Titicaca and he sampled in the vicinity of Cochabamba and in the Amazon lowlands with the amateur entomologist Rudolf Zischka.
He described the type species as Hemipramphus praematurus and Louis Pierre Giltay raised the genus Schindleria for this distinctive fish in 1934.