Fethullah Gulen is a Turkish Islamic scholar of the thoroughly jihadist Sufi Ottoman tradition with a controversial history and many followers and admirers in both the Islamic and Western worlds. He is known as the spiritual leader of an Islamic socio-political movement that now spans the globe with a network of some 1,500 schools, including universities, in more than 120 countries including the U.S. This monograph offers readers a comprehensive overview of the reclusive figure at the center of this disturbing global enterprise, his philosophy, role in Turkish society, place in the American educational system, and what that growing influence portends for U.S. students and society.