Maurits Beer was born on 6 March 18093 as a son of Nathan Hermanus Beer and Paulina Scheffer. When ne no longer lived at home and still was unmarried, Maurits lived in with Kijzer at Nieuwe Prinsengracht 64 and per 18 August 1911 with Hartogs at Utrechtsestraat 30. Maurits was employed as a shop-assistant.
Maurits married in Amsterdam on 14 August 1919 to Nanette Salomons (usually called Nanny), …