Duncan Lewis

Major General Duncan Lewis AO, DSC, CSC
13th Director-General of Security
In office 15 September 2014 – 15 September 2019
Prime Minister	Tony Abbott Malcolm Turnbull Scott Morrison
Preceded by	David Irvine
Succeeded by	Mike Burgess
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 71)
Profession	Military
Military service
Allegiance	Australia
Branch/service	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 East Timor (UNTAET)
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 an Australian military officer, diplomat and intelligence chief. From 2014 to 2019, he was the 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.