IT IS a long way from the Anatolian plains to a campus in the heart of London, where eminent scholars of religion deliver learned papers. And the highlands that used to form the Soviet border with China, an area where bright kids long for an education, seem far removed from a three-storey house in Pennsylvania, where a revered, reclusive teacher of Islam lives.

What links these places is one of the most powerful and best-connected of the networks that are competing to influence Muslims round the globe—especially in places far from Islam's heartland. The Pennsylvania-based sage, Fethullah Gulen, who stands at the centre of this network, has become one of the world's most important Muslim figures—not only in his native Turkey, but also in a quieter way in many other places: Central Asia, Indochina, Indonesia and Africa.