Lorenzo Vidino is the director of the Program on Extremism at George Washington University. He is the author of The Closed Circle: Joining and Leaving the Muslim Brotherhood in the West and a member of the Advisory Board of the Austrian government’s Observatory on Political Islam.
Austrian Chancellor Sebastian Kurz (R), President of the European Council Charles Michel (C) and Austria's Europa minister Karoline Edtstadler (L) pay respects to the victims of a terrorist attack in Vienna, Austria on Nov. 9.
Then-Turkish Prime Minister Recep Tayyip Erdogan speaks to Turkish expatriates at an event to mark the 10th anniversary of the Union of European Turkish Democrats in Cologne, Germany, on May 24, 2014.