Jason was born and raised in Western Sydney where he attended Cabramatta Public School and Canley Vale High School before graduating with a Bachelor of Arts (Honours) and a Bachelor of Laws from the University of New South Wales.
Before entering Parliament he worked as a senior adviser to NSW Premier Bob Carr and as an executive at Transurban, one of Australia's top 100 companies.
In November 2007, Jason was elected as the Federal Member for Blaxland. In June 2009, he was appointed Parliamentary Secretary for Employment. In September 2010, he was appointed Minister for Defence Materiel. In December 2011, he was appointed Minister for Home Affairs and Minister for Justice. Following the 2013 election, Jason was appointed Shadow Minister for Communications. In July 2016, he was appointed Shadow Minister for Trade and Investment as well as Shadow Minister for Resources and Northern Australia. In June 2019, Jason was appointed Shadow Minister for Regional Services, Territories and Local Government and Shadow Minister for Housing and Homelessness.
Jason is the Patron of CLAN (Care Leavers Australia Network), the Bankstown Youth Development Service (BYDS), the Bankstown City Relay for Life, the Bankstown Sports Club, and the Bankstown RSL.
Jason is married to Louise and father to Jack.