The Gülen, or Hizmet, movement in Turkey is the country's most powerful and affluent religious organisation. Its central tenet, advanced by its founder, the charismatic Sunni preacher Fethullah Gulen (b. 1941), is that Muslims should engage positively with modernity. A prime means of advancing this philosophy has been education: at hundreds of Gulen-run schools and universities, not only in Turkey but also worldwide, instructors aim to cultivate the next generation of Muslim bankers, biologists, software engineers and politicians. But how does the Gulen movement resolve the sometimes conflicting positions of Sunni Islam and contemporary science for example, on evolutionary theory? Drawing on sustained ethnographic research conducted among Gulen communities in Turkey, Caroline Tee analyses their complex attitudes towards secular modernity. She focuses on education, science research and industry to explore how pious Muslim practitioners engage in science at high levels, arguing that the Gulen movement's success in this critical area of modernity has facilitated its rise to prominence in recent decades. Considered against the backdrop of Turkish politics, and particularly the acrimonious power-struggle between the Gulen movement and its erstwhile ally, Turkey's ruling AK Party, Gulenist engagement with modern science is revealed as a key source of its influence and success.