This is the first book of its kind about the Turkish Muslim scholar, Fethullah Gulen, since the July 2016 events in Turkey, the trauma experienced by Gulen, and the disruption to initiatives inspired by his teaching, known as Hizmet. Drawing on primary interviews with Gulen and Hizmet participants and a literature review, this Open Access book locates the clear origins of Gulen's teaching in the Qur'an and Sunnah in dynamic engagement with their geographical, temporal and existential reception, translation, and onward communication. It argues that as Hizmet cannot be understood apart from Gulen and his teaching, Gulen and his teaching cannot be understood apart from Hizmet, while exploring the heritage of both. A more geographically focused case study is set out in author Paul Weller's Hizmet in Transitions: European Developments of a Turkish Muslim-Inspired Movement, also published by Palgrave Macmillan (2022).