In January 1968, Cornall took up a position in the lawfirm Oswald Burt & Co (later Middeltons Oswald Burt, Solicitors).[2] He was promoted to Partner of the firm in July 1972.[2]
Cornall left Middeltons Oswald Burt, Solicitors in 1987 and moved to a position as Executive Director and Secretary of the not-for-profit member-based Law Institute of Victoria.[2][3]
Between December 1995 and December 1999, Cornall was the Managing Director of Victoria Legal Aid.[4]
As Secretary of the Attorney-General's Department he commented on the alleged torture of Mamdouh Habib.[9] He stated there was no substance to the allegations; however, the Australian Government later settled with Habib out of court.[10]
After his retirement Cornall conducted an investigation for the Australian Government into allegations of sexual abuse at Manus Island.[11]
In February 2014 he was appointed to conduct 'a review into the circumstances surrounding the Manus Island disturbances, in which an Iranian detainee (Reza Berati) was killed,[14] with the primary focus on management of security at the centre.[15][16][17]
Awards
In 2006, Cornall was appointed an Officer of the Order of Australia for service to the community through contributions to the development of public policy, particularly counter-terrorism arrangements in a changing global security environment and through providing advice and governance across a diverse range of responsibilities within the civil justice system.[4]