During his military career, Lewis served three postings with the Special Air Service Regiment, later commanding the Regiment from 1990 to 1991. For this service, Lewis was decorated with the Conspicuous Service Cross (CSC).[2]
Lewis was promoted to brigadier in January 2000 and appointed Commander Sector West UNTAET in East Timor, where he commanded Australian and New Zealand forces. He was awarded the Distinguished Service Cross (DSC) for his accomplishments with the unit.[3]
Subsequent to his retirement from the army in 2005, Lewis joined the Australian Public Service and was appointed to the position of First Assistant Secretary of the National Security Division in the Department of the Prime Minister and Cabinet. In December 2008 he began serving as National Security Adviser to the Rudd Labor Government.[1] On 5 August 2011 it was announced that he would be appointed the Secretary of the Australian Department of Defence, (SECDEF), effective early September.[5] Lewis was the first former military officer to be appointed to this position.[6]
Diplomatic career
On 17 September 2012, it was announced that Lewis had been appointed Australia's ambassador to Belgium, the European Union, Luxembourg and NATO, and would leave the Department of Defence on 10 October.[7] While newspaper reports suggested that Lewis was unhappy with the government's cuts to defence spending,[8] he stated that "notwithstanding media reporting, I have not been forced out of my current position and I am not departing defence for any reason other than to take up this ambassadorial posting at the request of the prime minister".[9]
^It's an Honour – Officer of the Order of Australia, 26 January 2005. Citation: For distinguished service and performance of duty as Commander Special Forces and subsequently as the inaugural Special Operations Commander Australia.