David Kilcullen is one of the world's most influential experts on counterinsurgency and military strategy. He was senior advisor to General David Petraeus in 2007 and 2008, when he helped to design and monitor the Iraq War coalition troop 'Surge'. He was then appointed special advisor for counterinsurgency to U S Secretary of State Condoleezza Rice. Before this, he was chief strategist in the Counterterrorism Bureau of the US State Department, and he has also advised the UK and Australian governments, NATO and the International Security Assistance Force. He is a former Australian Army officer and the author of three books. His latest is called "Blood Year: Islamic State and the Failures of the War on Terror".