Collier was a quadriplegic, due to serious spinal injuries in a car accident on the way to his twenty-first birthday celebrations.
[3] He held a DPhil from the University of Oxford, and held advisory roles with the Australian Broadcasting Corporation and for the federal Minister for Disability.
[4] He founded the Dignity for Disability party in South Australia, standing as its candidate for the South Australian Legislative Council in 2006 and 2010.
He died after a brain haemorrhage a few weeks before the 2010 election, in which his party gained enough votes for a seat in the council; this was taken by the second candidate on the ticket, Kelly Vincent.
In 2013, a scholarship in Collier's name was set up to assist potential leaders with disabilities.