He rejected David Hansemann's offer to work for the Disconto-Gesellschaft in Berlin and instead started to practice as a lawyer and notary in Ratibor (Racibórz).
After being publicly insulted by the Prussian minister of justice, Leopold zur Lippe-Biesterfeld-Weißenfeld, Salomonsohn closed his law office to return to Berlin and started to work for the Disconto-Gesellschaft in 1863.
[1][3] In 1868 he married Sara Rinkel (1851–1929) from Landeshut, Silesia (Kamienna Góra); they had three daughters and one son, Georg (1869–1957), who also became a banker.
Salomonsohn was also a member of the administrative board of the Norddeutsche Bank, the "Union AG für Bergbau" (Dortmund), the potash works Aschersleben and the "Gelsenkirchener Bergwerks-AG", whose director Emil Kirdorf was a close friend.
[1] Salomonsohn retired from the active management of the Disconto-Gesellschaft in 1888 but remained a member of the supervisory board until his death on 4 January 1919 in Berlin.