|President of Austria|
9 June 1965 – 24 April 1974
|Preceded by||Adolf Schärf|
|Succeeded by||Rudolf Kirchschläger|
|Born||4 October 1899|
Floridsdorf, Austria-Hungary (present-day Vienna)
|Died||24 April 1974 (aged 74)|
|Political party||Social Democratic Party of Austria|
He was a typesetter by profession and a member of the Social Democratic Party of Austria. After World War II he got involved in Viennese communal politics and was mayor of Vienna from 1951 to 1965. From 1965, he was federal president and was re-elected in 1971.
He 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.
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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| Mayor of Vienna