Debus was born in Ryde, New South Wales and educated at Homebush Boys High School[1] and Sydney University, graduating in Law and Arts in 1967.
He was the longest serving environment minister in any Australian jurisdiction and oversaw the expansion of the national park system of New South Wales by over one-third .
He initiated the project to create an unbroken chain of protected areas and other lands managed for conservation to stretch 2800 km along the Great Divide of Eastern Australia.
In response the Government released a NSW Police Service report stating that a minister had been the subject of complaints (not an investigation) which were dismissed in 2003 as spurious and groundless.
[4] It was subsequently reported that Debnam's source for the accusation was a convicted bank robber and child sex offender with a long history of making unsubstantiated allegations.
On 6 June 2009, Prime Minister Kevin Rudd announced a cabinet reshuffle without Mr Debus, who, after 28 years in state and federal politics had decided to retire.
[8][9] It was revealed in October 2008 that the Australian Crime Commission had compiled a secret file on Debus, sparking condemnation by former and serving police officials.