David Mannes Keizer was married to Clara Adele de Beer. He and his wife lived at 67 Langestraat in Winschoten.
David Mannes Keizer was a draper. He was chairman of the Winschoten concert association and of the Winschoten chapter of the Maatschappij tot Nut der Israëlieten in Nederland.
G.S.Koeman-Poel, Een synagoge op het kruispunt van de winden (De Joden van Winschoten) 1750-1942 (Winschoten 2002) 158, 214
David Mannes Keizer was also a honorary member of the Winschoter Soccer Club.
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