[1] From 1993 to 1996, Languiller was electorate officer for former Deputy Prime Minister Brian Howe, and became Chief of Staff for Andrew Theophanous in 1996 until 1999.
[2] In 1999, he was selected as the Labor candidate for the safe seat of Sunshine, succeeding Ian Baker whom he had beaten in the preselection, and was duly elected.
In February 2017, The Age newspaper reported that Languiller had claimed $37,678 in second residence allowances to live in Queenscliff, a considerable distance from his western suburbs electorate of Tarneit.
[4] In January 2018, Victoria Police announced it had conducted an investigation into the allowance claims of Languiller and deputy speaker Don Nardella, and found insufficient evidence to charge either man with an offence.
He attended high school at Flemington in Victoria, and received a Bachelor of Arts majoring in sociology and politics from Footscray Institute of Technology.