In 1996, Gallacher was appointed to the New South Wales Legislative Council, filling a casual vacancy caused by the resignation of
Stephen Mutch. Gallacher had won preselection for the vacancy in a field of ten candidates. The other candidates included former Liberal minister Anne Cohen who had lost her lower house seat at the 1995 election and Catherine Cusack who would eventually be elected to the Legislative Council in 2003. He first faced election at the
2003 state election and was re-elected. In 2005, he was appointed Shadow Minister for Police in the
New South Wales Shadow Cabinet and was appointed the portfolio of Shadow Minister for the Hunter in April 2007. Following the
2011 state election which saw the O'Farrell government come to power, on 3 April 2011 Gallacher was appointed Minister for Police and Emergency Services, Minister for the Hunter, and vice-president of the Executive Council, Leader of the Government in the Legislative Council. In December 2013 Gallacher took on the additional responsibilities as Minister for the Central Coast following the resignation of the incumbent minister,
Chris Hartcher. Due to the resignation of
Barry O'Farrell as Premier, and the subsequent ministerial reshuffle by Mike Baird, the new Liberal Leader, On 2 May 2014, the
Independent Commission Against Corruption heard allegations that Gallacher was involved with
Chris Hartcher in the establishment of a business called Eightbyfive which sought to conceal prohibited donations to the Liberal Party from a development company owned by
Nathan Tinkler. Later that day, Premier
Mike Baird announced that Gallacher had resigned from
Cabinet. He sat on the crossbench. Prior to his ministerial resignation, it had been reported that Gallacher was interested in moving to the Legislative Assembly with the intent of becoming Liberal Leader one day. Gallacher resigned as an MP in April 2017 to become to CEO of
Ports Australia. In October 2019, the Inspector of the Independent Commission Against Corruption appeared at the NSW Parliament's ICAC Oversight Committee and stated that there had been no finding of corrupt conduct against Gallacher, while calling his treatment "wrong and unfair." ==References==