Background
Cox was the eldest son of George Cox a pioneer Sydney pastoralist and a grandson of William Cox who constructed the first road across the Blue Mountains.
Cox was the eldest son of George Cox a pioneer Sydney pastoralist and a grandson of William Cox who constructed the first road across the Blue Mountains.
Cox was educated at the The King"s School, Parramatta and developed extensive pastoral interests in Dubbo, Mudgee, the Warrego River District and the Liverpool Plains. Cox was elected as the representative for the seat of Wellington (County) in the first Legislative Assembly convened after the granting of responsible self-government in 1856. He was subsequently re-elected unopposed at the 1858 colonial election but did not contest the 1859 election when the seat of Wellington (County) was abolished.
He received a life appointment to the Legislative Council in 1863 and became an active supporter of the Free Trade Party.
He was a member of the New South Wales Legislative Council between 1863 and 1901. He was also a member of the New South Wales Legislative Assembly between 1856 and 1859.