He has served as the New South Wales Minister for Aboriginal Affairs and Treaty, Gaming and Racing, Veterans, Medical Research and the Central Coast since April 2023.
He has been a Labor Party member of the New South Wales Legislative Assembly since 2015, representing the electorate of Wyong.
In January 2010, he was appointed as Parliamentary Secretary Assisting the Minister for the Central Coast under the Keneally Government.
At the 2011 state election, Harris lost the seat of Wyong to his Liberal opponent, local small businessman Darren Webber.
Late in 2011, Harris was appointed as the new principal at Point Clare Public School, to begin in the new year.
Following the election of Michael Daley as Leader of the Opposition, Harris was also appointed as Shadow Assistant Minister for Education.