Brown joined the Liberal Party in 1955, at the age of 15. He was first elected to the House of Representatives in 1969, standing in the Division of Diamond Valley. He was 29 years old at the time, making him the Coalition's youngest MP. He was defeated by the Labor candidate in 1972, and returned to his legal practice, focusing primarily on industrial law. Brown reclaimed Diamond Valley at the 1975 election. In 1980, he spent several weeks in Zimbabwe as the head of a team of Australian observers at the 1980 elections. In April 1981, he was elevated to the ministry as Minister for Employment and Youth Affairs in the Fraser Government. He was briefly appointed Minister for Business and Consumer Affairs following the forced resignation of John Moore in April 1982. His major act in that portfolio was the announcement of an inquiry into the "colour-television affair" which had led to the resignations of Moore and Michael MacKellar. The following month Brown was promoted to cabinet as Minister for Communications. He held that position until the Fraser Government was defeated at the 1983 election; he again lost the seat of Diamond Valley to a Labor candidate. At the early 1984 election, Brown re-entered parliament as the member for the newly created Division of Menzies. After the election he was appointed to Andrew Peacock's shadow cabinet as Shadow Attorney-General. In September 1985, Brown was elected deputy leader of the Liberal Party and thus Deputy Leader of the Opposition, roles which had been vacated by John Howard when he replaced Peacock as party leader. He defeated eleven other candidates for the position, finishing with 36 out of 70 votes on the final ballot compared with fifteen for Ian Macphee, eleven for John Moore, and eight for Peter Shack. In December 1985, Brown acted as party leader for two weeks while Howard recovered from an ear operation. However, National Party leaderIan Sinclair was the acting leader of the opposition during that time. Brown served as Howard's deputy until July 1987, when a leadership spill was called in the aftermath of the party's defeat at the 1987 election. After several other candidates emerged, he did not recontest the position and was replaced by Andrew Peacock. Brown remained a Coalition frontbencher – under Howard, Peacock, and John Hewson – until his unexpected resignation from parliament in February 1991. He returned to his law practice. The resulting by-election was won by the Liberal candidate Kevin Andrews.
Later life
In 1993, Brown published a memoir titled On the Other Hand: Sketches and Reflections From Political Life. Reviewing the book for The Canberra Times, Jack Waterford compared it to the Alan Clark Diaries and described the author as "one of the more remarkable politicians to ever reach the top, or near top, of the Liberal Party". Brown let his membership of the Liberal Party lapse in 2001, due to dissatisfaction with the actions of the Howard Government. As of 2006, he was a mediator and arbitrator in domestic and international commercial, trade and construction matters and in Internet domain name disputes. Brown writes a weekly column for The Spectator Australia.
Personal life
Brown married in 1985, and had two stepchildren from his wife's first marriage. His wife Margaret was the Liberal candidate at the 1989 Greensborough state by-election. They later divorced and she remarried. Brown came out publicly in 1996, when he was included in OutRage magazine's list of prominent gays and lesbians. In a 1998 interview, he said that his wife had known about his sexuality before they married. He described himself as gay, but also agreed that the term bisexual was applicable. He was one of the first Australian politicians – serving or otherwise – to come out publicly.
Honours
1 January 2001: Centenary Medal for service to the Commonwealth Parliament and Government from 1969 to 1991