The son of Henry Nathan, Nathan was educated at the London University School and became a wholesale merchant in Victoria, British Columbia.[3] He represented Victoria City in the assembly of the Colony of British Columbia from 1870 to 1871.[1] Like De Cosmos, Nathan was part of British Columbia's delegation to Ottawa to negotiate the terms of B.C.'s entry into Confederation.
Once in Parliament, Nathan supported the government of Sir John A. Macdonald. This strained his relationship with De Cosmos, who had become a supporter of MacDonald's opponent, Liberal Alexander Mackenzie. As a result, Nathan took to calling de Cosmos "Cupid" in private letters (de Cosmos' name roughly translates to "Lover of the Universe").[4]
The byelection of 1871 was held to return members from newly admitted British Columbia to the 1st Parliament of Canada that had been elected four years earlier following Confederation. With Nathan joining that Parliament, the multicultural nature of the Canadian nation was firmly established.
In 1876, Nathan returned to England. He died in London at the age of 71.[3]