Duncan Lewis

Major General Duncan Lewis AO, DSC, CSC
Duncan Lewis in 2001
13th Director-General of Security
Incumbent
Assumed office 15 September 2014
Prime Minister	Tony Abbott Malcolm Turnbull
Preceded by	David Irvine
Australian Ambassador to Belgium, Luxembourg, European Union and NATO
In office 18 October 2012 – 2014
Preceded by	Dr Brendan Nelson
Succeeded by	Mark Higgie
18th Secretary of the Department of Defence
In office 5 September 2011 – 18 October 2012
Preceded by	Dr Ian Watt
Succeeded by	Dennis Richardson
1st National Security Adviser
In office 2008–2011
Preceded by	New Creation
Succeeded by	Dr Margot McCarthy
Personal details
Born	(1953-08-03) 3 August 1953 (age 63)
Profession	Military
Military service
Allegiance	Australia
Service/branch	Australian Army
Years of service	1975–2005
Rank	Major General
Commands	Special Operations Command (2002–04) Sector West UNTAET (2000) Special Air Service Regiment (1990–91)
Battles/wars	1982 Lebanon War International Force for East Timor United Nations Transitional Administration in East Timor
Awards	Officer of the Order of Australia Distinguished Service Cross Conspicuous Service Cross

Major General Duncan Edward Lewis AO, DSC, CSC (born 3 August 1953) is the current Director-General of Security of the Australian Security Intelligence Organisation (ASIO). Prior to that appointment, he held the post of Australian Ambassador to the Kingdom of Belgium, the Grand Duchy of Luxembourg, the European Union and the North Atlantic Treaty Organization. He is a retired Australian Army officer, and formerly Special Operations Commander Australia (2002–2004), National Security Adviser, and Secretary of the Department of Defence.

Duncan Lewis graduated from the Royal Military College, Duntroon in 1975. Following graduation, he was assigned to the Royal Australian Infantry Corps. He holds a Bachelor of Arts degree from the University of New South Wales and a Graduate Diploma in Defence Studies and Management from Deakin University. He attended the British Army Staff College, Camberley and the US Army War College.