The Gülen, or Hizmet, movement in Turkey was until recently the country's most powerful and affluent religious organization. At ist head is the exiled Muslim preacher Fethullah Gülen, who leads from a gated compound in the Pocono Mountains of the USA. The movement's central tenet is that Muslims should engage positively with modernity, especially through mastering the sciences. At hundreds of Gülen-run schools and universities, not only in Turkey but also worldwide and particularly in the United States, instructors have cultivated the next generation of Muslim bankers, biologists, software engineers and entrepreneurs. In this groundbreaking study, Caroline Tee, an expert on the Gülen Movement, analyses the complex attitudes of Gülen and his followers towards secular modernity. Considered against the backdrop of Turkish politics, Gülenist engagement with modern science is revealed as a key source of the influence the movement has exerted.