David Cassier was the youngest son of Isaäc E. Cassier and Elisabeth de Leeuw. He was an upholsterer and worked for David van Dien, a textile goods merchant in Alphen. He was married to Mietje Waterman. They had two children, Israël and Isaäc Emanuel. The family lived at 81 rood Gouwsluisseweg in Alphen. On 11 April 1942 the police of Alphen ordered the Cassiers to leave their home within four days based on the judgement of the Alphen district court pronounced at the request of the Alphen shipping agent A. Verkerk. The family moved to 44 Visserstraat in Alphen. In August 1942 David Cassier and the members of his family were summoned. On 12 August they travelled to Westerbork, from where they were deported to Auschwitz on 17 August.
The Alphen police records of 2 September 1941 read as follows: 'Assisted four officers with the Hausraterfassung at 187 Apollolaan in Amsterdam and with searching the homes of the Jewish family Cassier and others here. The Cassier residence has been sealed, as the inhabitants have left'.
L. de Brouwer, De Joodse Gemeente Alphen aan den Rijn, 1792-1964 (Haarlem 2002) 35
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