Together, they co-founded Stern Brothers, a financial institution based in London.

[2] In 1869, Stern received the Portuguese noble title of barão (baron) from King Luís I of Portugal.

From 1883 to 1887, Stern was the owner of Strawberry Hill House in Twickenham, but he never lived there.

[1] Stern died in London on 20 October 1887[1] and was buried at Balls Pond Road Cemetery.

[4] One of the wealthiest British men of his time, he left an estate of £3,544,978 (equivalent to £0.49 billion in 2023[5]).