Egbert Gustaaf Polak was a son of Mozes Samuel Polak and Abigael de Vries. He was first married to Henriette Emilia Burkhard. She passed away in 1928 in Halle. He remarried in 1930 in Halle.
Stadsarchief Amsterdam, archiefkaart Egbert Gustaaf Polak
Egbert Gustaaf Polak died on 20 June 1943 in Westerbork transit camp and he was cremated on 22 June 1943. The urn with his ashes was placed on the Jewish cemetry in Diemen on field U, row 10, grave nr. 8.
Register van joden die in het kamp Westerbork zijn gecremeerd, 1943-1944; archief van de gemeente Westerbork, opgenomen in het archief van de gemeente Midden-Drenthe te Beilen, inv. n 3789