This person is commemorated on a memorial in Borne. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.
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This is the Van Gelder's Jazzband named “De Gaiety Hoppers”. From left to the right son Iwan van Gelder (who survived the Holocaust), father Aron van Gelder “the Nun”, an unknown pianist, son Alfred van Gelder and son Frits van Gelder. In the twenties or thirties they lived in Borne. Photo made about 1925.
Source: website stolpersteine Borne/familiegeschiedenis/familie van Gelder