Jesaja Beek was one of the seven children of Izaak Leon Beek and Matje Mok. His father Izaak was already widowed since 1927 and he himself he passed away in 1935 and was interred in the Jewish Cemetery at Muiderberg.
Jesaja Beek was a commercial agent and pollster and married 30 May 1917 in Amsterdam Vogeltje Frankfort from Amsterdam, born 30 April 1889 as daughter of Hijman Frankfort and Theresia…