1. John Clarkson Maddison was a New South Wales politician, Attorney General, Minister for Justice and Deputy Leader for the Liberal Party of New South Wales in the cabinets of Robert Askin, Tom Lewis and Sir Eric Willis until the Liberal party lost the 1976 election.
John Maddison was commissioned as a Lieutenant in the 2nd Australian Imperial Force, 53rd Anti-Aircraft Regiment, on 2 August 1942, serving in Borneo and the Philippines.
John Maddison became the vice president of the Constitutional Association of Australia from 1959 until 1964.
John Maddison married Suzanne Barry-Smith on 14 October 1953 and together had 2 daughters and a son.
John Maddison joined the Liberal Party in 1954, becoming Secretary and president of Pymble branch and a member of the state executive from 1958 until 1962.
John Maddison stood for preselection for the Legislative Assembly seat of Hornsby and gained it over the sitting member, Sydney Storey, who later resigned from the party as stood as an Independent Liberal candidate.
In 1970 John Maddison was sent as leader of the Australian delegation to the United Nations conference on prevention of crime in Japan.
In 1971, John Maddison was made a Councillor at Macquarie University, a position which he held until 1978.
Eric Willis resigned as Deputy Leader and John Maddison was elected in his place.
John Maddison remained as Attorney General until the Liberals lost the election to the ALP on 14 May 1976.
John Maddison held Ku-ring-gai for a further two elections until his retirement in 1980, causing a by-election that was won by future Liberal Premier of New South Wales, Nick Greiner.
When Willis resigned as Leader, John Maddison announced his intention to contest the vacant leadership against David Arblaster, Peter Coleman and Kevin Rozzoli, thereby resigning as Deputy Leader.
When Mason emerged successful as the new Leader, John Maddison expressed that he was "a little aghast" at the result.