Marcus Kok studied medicine in Amsterdam, where he sat for his medical finals on 10 March 1926. He lived and practised medicine at 7 Olympiastraat in Amsterdam. Marcus Kok died en route from Buchenwald to Theresiënstadt.
J.H. Coppenhagen, Anafiem Gedoe‘iem. Overleden joodse artsen uit Nederland 1940-1945 (Rotterdam 2000) 109
As a result of the anti-Jewish regulations during the war he was not allowed anymore to treat non-Jewish patients..
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