Martin Bucer (1491-1551) was one of the most important sixteenth century Reformers, who became leader of the Reformed Churches in Switzerland and South Germany after the death of Zwingli. To mark the 500th anniversary of his birth, an international team of specialists on Bucer highlight his contribution in thought and practice to building the community of the Church in England and Europe. The issues addressed also raise matters of contemporary significance, such as Church-state relations, Protestant-Catholic unity, and tensions between a church of true believers and a people’s church.