Hendrik Jan de Marez Oyens (1843-1911).
- Profession: Stockbroker, Commission agent in securities, Banker, treasurer of the Royal Concertgebouw.
- Relation to Mahler: One to the initiators and founders of the Amsterdam Royal Concertgebouw, who knew each other from the Old Exchange (Oude Beurs) in amsterdam, where they formed a “musical” group.
- Correspondence with Mahler:
- Father: Gerrit Hendrik de Marez Oijens (1811-1883).
- Born: 11-08-1843 Amsterdam, the Netherlands.
- Married: 1879 Marie Cornelie Reynvaan (1854-1926). Alma Mahler stayed with her during the Gustav Mahler Festival Amsterdam 1920.
- Lived at Keizersgracht 317, Amsterdam, the Netherlands. House Hendrik Jan de Marez Oyens.
- Died: 17-07-1911 Amsterdam, the Netherlands.
- Buried: 00-00-0000 Zorgvliet, Amsterdam, the Netherlands.
- Bankier, lid bestuur Mij. Felix Meritis, lid bestuur Vereniging “Rembrandt”, lid bestuur afdeling Amsterdam Mij. tot bevordering der Toonkunst, lid raad van beheer N.V. “De Stads-Schouwburg-Mij”, lid bestuur Amsterdamsche Vereeniging voor Gezondheids- en Vakantie-Kolonies, lid commissie voor huisbezoek Genootschap “Liefdadigheid naar Vermogen”.
Attention: Same name, 46 years later: Hendrik Jan de Marez Oijens (1889-1953)
- Profession: Classicus, teacher at Barlaeus Gymnasium, Amsterdam, the Netherlands.
- Born: 13-04-1889 The Hague, the Netherlands.
- Died: 24-10-1953 Huis ter Heide, Zeist, the Netherlands.
- Knew Louis Couperus personally.
- Music lover.
- Wrote texts for the program booklet of the Amsterdam Royal Concertgebouw Orchestra (RCO/KCO).
- He knew Alma Mahler (1879-1964) after who het named his daughter.
- Lived at Keizersgracht 630, Amsterdam, the Netherlands.