Who is Daisaku Ikeda? At one level, he is the leader of a religious movement - Soka Gakkai - which began in Japan, where it still has its headquarters, but which now claims 12 million adherents around the world. At another level, he is a globetrotting figure whose formal conversations with diverse writers, thinkers and diplomats - including Arnold Toynbee, Joseph Rotblat and Mikhail Gorbachev - have garnered him an international profile, as well as...