Jonas Jacobs studied medicine in Amsterdam, where he sat for his medical finals on 23 November 1932. He lived and practised medicine at 49 Den Texstraat in Amsterdam. Jonas Jacobs was married to Lena Melkman. Lena Melkman studied medicine in Amsterdam, where she sat for her medical finals on 26 February 1936. She also took a masters degree in education. According to the Geneeskundige Jaarboekjes (…