Background
Mann was born in Mount Gambier, South Australia and was the brother of Frederick Mann, Chief Justice of the Supreme Court of Victoria from 1935 to 1944.
Mann was born in Mount Gambier, South Australia and was the brother of Frederick Mann, Chief Justice of the Supreme Court of Victoria from 1935 to 1944.
He was educated at the University of Melbourne and was appointed government analyst in Western Australia in 1895 and set up the government laboratory in Perth.
He was appointed to the Commonwealth Advisory Council for Science and Industry from 1916 to 1920, although his participation was limited, partly due to the distance between Perth and Melbourne. Mann was elected as the member for Perth at the 1922 election, defeating disendorsed Nationalist James Fowler. He was responsible for the passage of the Electoral Acting 1924 through the House of Representatives, introducing compulsory voting.
In 1929, he attacked the government over its failure to prosecute John Brown for illegally locking out his employees, resulting in his exclusion from party meetings
Later in the year, he voted with Billy Hughes and three others to bring the Bruce government down over the Maritime Industries Bill—which would have abolished the Commonwealth Court of Conciliation and Arbitration—forcing it to the 1929 election and its defeat. He also lost his seat running as an independent.
Mann soon became the Australian Broadcasting Commission"s chief commentator with his daily news session, At home and abroad, and a weekly programme, The news behind the news. He spoke anonymously under the pseudonym of "The Watchman", and regularly offended the government with his trenchant criticism.
The Menzies government censored him and he resigned from the American Broadcasting Company to contest the seat of Flinders at the September election, but lost narrowly.
He could not regain a satisfactory position on the American Broadcasting Company and moved to commercial radio.
Like his predecessor he opposed high tariffs and he publicly criticised party leader and Prime Minister, Stanley Bruce over the issue.