Siegfried David Polak had studied Dental Surgery in Utrecht. He started his studies there in 1932.
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Siegfried David Polak was single. He was a dentist.
K. Ribbens, Zullen we nog terugkeren
. De jodenvervolging in Amersfoort tijdens de Tweede Wereldoorlog (Amersfoort 2002) 170-171
In addition, a Jokos file (number 11601) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.