GREG Sheridan, The Australian’s foreign editor, is one of the nation’s most influential national security commentators, who is active across television and radio and also writes extensively on culture. He has written seven books. His latest, “God is Good for You: A Defence of Christianity in Troubled Times”, is a passionate defence of religious belief in a secular age. Before that, “When We Were Young and Foolish” was an entertaining memoir of culture, politics and journalism. As foreign editor, he specialises in Asia. He has interviewed Presidents and Prime Ministers across the world.PC