Background
Jacob was born in Jessore, Bangladesh, second surviving son of Captain Vickers Jacob (1789-1836), Indian army and later merchant and landholder in New South Wales, and his wife Anne née Watson (1796-1836).
Jacob was born in Jessore, Bangladesh, second surviving son of Captain Vickers Jacob (1789-1836), Indian army and later merchant and landholder in New South Wales, and his wife Anne née Watson (1796-1836).
Jacob was member for Lower Hunter in the New South Wales Legislative Assembly from 7 March 1872 until 9 November 1880 and succeeded Ezekiel Baker as Secretary for Mines in the Robertson Ministry in November 1877, retiring with his colleagues the following month. He then represented Gloucester from 27 November 1880 until 23 November 1882. Jacob was nominated to the New South Wales Legislative Council on 9 October 1883, and was Chairman of Committees of that body.
Jacob was a member of the Council until his death.