Hendrik Jan de Marez Oyens (1843-1911). Profession: Stockbroker, Commission agent in securities, Banker, treasurer of the Royal Concertgebouw. Relation to Mahler: ...
Jerome Alexander Sillem (1840-1912). (1890) Profession: Lawyer, rentier. Relation to Mahler: One to the initiators and founders of the Amsterdam Royal ...
Pieter Anton Lodewijk van Ogtrop (1835-1903). Profession: Stock broker. Relation to Mahler: Chairman of the board of the Amsterdam Royal Concertgebouw 1888-1903 ...