He has been coordinating research on terrorism and radicalisation , which has resulted in several publications . '' Jihadi Terrorism and the Radicalisation Challenge . European and American Experiences '' was published by Ashgate in 2011 . This volume was included in the 2012 " Top 150 Books on Terrorism and Counterterrorism " , established by the academic journal '' Perspectives on Terrorism '' . His analysis on the impact of 9/11 on Europe was published in 2013 in a volume edited by Mohammed Ayoob and Etga Ugur of Michigan State University ( " Europe : Reinforcing Existing Trends " , in : '' Assessing the War on Terror '' . Lynne Rienner , 2013 , pp . 137 – 159 ) . His most recent studies on radicalisation and terrorism have all been released by the Egmont Institute : '' Returnees – Who are they , why are they ( not ) coming back and how should we deal with them ? Assessing policies on returning Foreign Terrorist Fighters in Belgium , Germany and the Netherlands '' ( with Thomas Renard , February 2018 ) ; '' Anticipating the post-Daesh landscape '' ( October 2017 ) ; '' ‘ All Radicalisation is Local ’ . The genesis and drawbacks of an elusive concept '' ( June 2016 ) ; '' Facing the fourth foreign fighters wave . What drives Europeans to Syria , and to Islamic State ? Insights from the Belgian case '' ( March 2016 )
9/11
September 11 attacks
Rik Coolsaet