In 1945 he left his teaching position and took on a legal practice in Box Hill, Melbourne and stood for mayor.
For his work as Mayor of Box Hill he was appointed an Officer of the Order of the British Empire in the 1962 New Year's Day Honours.
[1] Following his death in 2004, McIntyre's family donated papers and documents, relating to the Portuguese voyages and the early mapping of the western Pacific, to the manuscript collection at the National Library of Australia.
With the 1951 double dissolution election not yet triggered but considered inevitable, McIntyre noted that the extant circumstances – the single transferable vote with proportional representation method which had been adopted by the Senate in 1949, the close opinion polls between the two major parties, and no minor parties with a credible chance of winning a seat – meant that a 5–5 result for senators elected in each of the six states, leading to an overall 30–30 deadlock, was highly likely.
[7] His suggestion formed the basis of the Constitution (Avoidance of Double Dissolution Deadlocks) Bill, which passed the House of Representatives, but was defeated at Senate committee and never reached a referendum.