Having attended both St. Albans High School and University High School, Clark undertook his tertiary education at the University of Melbourne, obtaining his BCom in 1980, an LLB in 1982 and a BA in 1986.
Student activism
Whilst at university, Clark became active in both the Melbourne University Liberal Club and the Australian Liberal Students' Federation, serving as the president and vice-president respectively of those organisations. While serving also as the treasurer of the Melbourne University Students' Representative Council, Clark was responsible for legal proceedings brought against the University concerning the collection of the student service fee. The action challenged the right of the University Council to award such funds to the SRC, and the subsequent right of the SRC to allocate those funds to the Australian Union of Students. In what was called the Kaye Judgement, the court ruled that the Student Service Fee was not a fee for services provided but was essentially a tax or charge. It was further ruled that the University of Melbourne was a "public authority exercising legislative powers", in that the University was unduly exercising a power in the absence of legislative approval from Parliament. Clark's instrumental role in these actions resulted in significant changes to the law relating to student unionism in Victoria.
Entry into politics
Clark joined the Liberal Party in 1976. He was an executive member of the Victorian Young Liberal Movement in 1986 and was Vice-Chairman of the Deakin Electorate Committee from 1986 to 1988. He has also been a member of the Party's Constitutional Committee since 1987.
Member of Victorian State Parliament
On 1 October 1988, after almost five years serving as a solicitor practicing in commercial, financial and labour law, Clark was elected to the Victorian Legislative Assembly seat of Balwyn. Following the division of electorate boundaries in 1991, Clark successfully sought re-election in the seat of Box Hill and subsequently assumed the role of Parliamentary Secretary to the Victorian Treasurer, Alan Stockdale, in 1992. From 1992 to 1999 he convened the Parliamentary Coalition's Treasury and Finance Committee. He was a member of the Coalition's Attorney-General's Committee 1992–1999, Education Committee 1992–1996, Tertiary Education Committee 1996–1999 and Multimedia Committee 1996–1999. Following the 1996 Victorian state election, Clark was appointed as Parliamentary Secretary, Treasury and Multimedia, a position he held until the Coalition lost Government in October 1999. From October 1999 until September 2001, Clark was Shadow Minister for Planning and Shadow Minister for WorkCover, from September 2001 to August 2002 was Shadow Treasurer, Shadow Minister for Finance and Shadow Minister for WorkCover and from August 2002 to November 2002 was Shadow Minister for Finance, Shadow Assistant Treasurer, Shadow Minister for WorkCover and Shadow Minister for Gaming. In November 2002, Clark assumed the post of Shadow Treasurer and held the position until December 2006. In December 2006, Clark was appointed as Shadow Attorney General, Shadow Minister for Industrial Relations, Shadow Minister for Information and Communication Technology and Shadow Minister for Energy and Resources. Following the Coalition's win at the 2010 state election, Clark was appointed Attorney-General of Victoria on 2 December 2010. After the defeat of the Coalition at the 2014 state election, Clark unsuccessfully contested the deputy leadership of the Liberal Party. Clark lost his seat in the 2018 election, suffering a nearly 8-point swing against him. Clark had held the seat or its predecessor for three decades. Shortly after his defeat, the Victorian branch of the Liberal Party elected him as its president, succeeding Michael Kroger.