He was an amateur competitive cyclist from 1949 to 1956, competing in the United Kingdom, Ireland, Belgium, Switzerland and Germany.
Cox was a City of Nunawading councillor from 1966 to 1969 and was campaign manager for Mitcham Liberal MLA Dorothy Goble at the 1970 and 1973 elections.
He worked as an adviser to the state opposition leader immediately after his election defeat, was an investment adviser for the Australian Natives Association from 1983 to 1988, and was a part-time staffer for federal Liberal MP Michael Wooldridge from 1987 to 1988.
[1] Cox made a second bid to re-enter politics at the 1988 election, when he regained the Liberal-leaning Legislative Council seat of Nunawading Province after their loss to Labor there in 1985.
[2] He served on the arts, conservation and environment and government tourism committees while in the Legislative Council, and retired in 1996 at the conclusion of his term.