Isaac van der Glas was a son of Jochem van der Glas and Elsje Bonnewit. He married 22 May 1919 in Amsterdam the non-Jewish Maria Johanna Eduardina Heick from Hamburg, a daughter of Christian Peter Heick and Hanne Marie Hansen. The couple had no children.
Isaac van der Glas, also known as Sjaak, lived at Kerkstraat 330 II in Amsterdam and worked as pianist among others at the Tuschinsky film theater. Sjaak met his future wife, (later known as "Aunt Wies") when she was in Amsterdam with a circus. One of her vaudeville show acts was riding on a little one-wheel-bike. She was chubby, which corresponded to the ideal of beauty of those days. And a romance began and they got married. After the vaudeville, Aunt Wies owned also a cafe at the Rembrandtplein in Amsterdam with "ladies of pleasure".
Isaac's sister Sientje, who was married to Marcus Degen, had her 2nd grandson in 1942, named Marcus, but he was called Max. His parents, Louis Degen and Rebecca Berger did not consider hiding because they thought that prosecution of Jews in Holland wouldn't be that serious. Nevertheless Rebecca brought her newborn babyboy to her uncle Sjaak van der Glas. His wife, Aunt Wies, offered to take Max' elder brother Sjakie into her house too but the parents decided that if they had to go to a labour camp, then Sjakie, 3 years old, could join them there, but not a baby. And so Rebecca came every day to the Kerkstraat to give her baby the breast and care for him.
Due to betrayal Isaac van der Glas was arrested and via the prison at the Amsterdam Weteringsschans sent to Camp Westerbork where he was registered on 17 April 1943. He stayed in barack 55 till 15 November 1943. That date he has been deported to Auschwitz, where he eventually lost his life on 31 May 1944.
City Archive of Amsterdam, archive cards of Isaac van der Glas and Maria Johanna Eduarina Heick; website www.wiewaswie.nl; the file cabinet of the Jewish Council of Amsterdam, card of Isaac van der Glas and parts from history as put on the website http://www.joodsmonumentzaanstreek.nl/degen-marcus-max-2/. by Max Degen.