Jonas was a fervent supporter of Esperanto, and starting in 1923, became a long-time instructor of the language. His address to the 1970 World Congress of Esperanto, which was held in Vienna, was delivered in Esperanto.[1]
In 1974, he died in office, the fourth consecutive president to do so.
In Vienna, a large tram station officially called Schottentor which was built when he was mayor is colloquially named after him (Jonas-Reindl, which translates as Jonas bowl).
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