Pope Francis, the first Latin American pontiff, was charged in his own way with opening the windows of the Catholic Church to the modern world with his election in 2013. But such a change was not going to happen without resistance from powerful forces within the ancient institution. Follow the successes and challenges of his papacy through this overview from the celebrated global religion journalist who has known Jorge Bergoglio intimately since their days together in Argentina.

As he marks his third anniversary on the job, Pope Francis is providing encouragement, renewed optimism and a new energy to many of the world’s 1.2 billion Catholics. It is an appeal that extends beyond Catholics as the humble leader addresses issues from the refugee crisis to the environment. But can one person, even someone as charismatic as Francis, bring about lasting change?