Josef Mayer's mother was Dutch. She was born in Maastricht, in 1816.
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Josef Mayer died on 20 April 1943 in Westerbork transit camp and he was cremated on 22 April 1943. The urn with his ashes was placed on the Jewish cemetry in Diemen on field U, row 4, grave nr. 12.
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
Lijst van in de concentratiekampen Westerbork en Buchenwald overleden Joodsche Personen die op Nederlandsche begraafplaatsen ter aarde werden besteld; NIOD, archief Westerbork, port. 1, map 1
In addition, a Jokos file (number 380) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 8087/9489).