Jacob Sanders studied medicine in Amsterdam, where he sat for his medical finals on 19 April 1913. He qualified on 6 May 1918 in Amsterdam on a thesis about 'Disease and death among Jews and non-Jews in Amsterdam'. He established himself as a family doctor at 240 Heemraadssingel in Rotterdam. In 1933, he was appointed as director to the 'Nederlandsch Instituut voor erfelijkheidsonderzoek bij den m…