Ferdinand Bloch was the youngest of six children of the sugar factory owner and banker David Bloch and his wife Marie, née Straschnow. He attended the Handelsakademie in Prague and joined the family business in 1881.
Ernst Egger was born in Vienna as the son of the industrialist Bernhard (Bela) Egger (1831–1910).
In 1938, Leo Fürst, who lived at Maria-Theresien-Straße 16/4 <
Robert Jonas was born in 1883 in Vienna, the son of Benjamin Jonas and his wife Flora, née Spitzer, from Ballasa-Gyarmat in northern Hungary. He completed his studies in 1904 at the Niedere und Höhere Fachschule at the k. k.
Johann, known as Hans, Klinkhoff was the illegitimate child of Emma Kikinis and Max Singer, official supplier of horses to the court.
Leopold Singer was born as a son of the Jewish merchant Wilhelm Singer and his wife Rosalie, née Klein in Vienna in 1869.