Nathan Söderblom (1866–1931) was Archbishop of Uppsala in the Church of Sweden and a pioneering force behind the modern ecumenical movement. A vocal advocate for peace and justice during and after World War I, he was awarded the Nobel Peace Prize in 1930. This award-winning biography by Jonas Jonson tells who Söderblom was, how he thought, and what he did, placing his groundbreaking ecumenical work within its academic, ecclesial, and political contexts.