Jacob Themans was the eldest of the six children of Hartog Themans and Rebekka Koopman.
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Jacob Themans was a member of the city council of Doetinchem from 1917-1923 for the liberal party. The Themansstraat in Doetinchem was named after him.
Michman e.a., Pinkas (Amsterdam 1999) 331
This person is commemorated on a memorial in Doetinchem. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.