Heinrich Bullinger (1504-1575) is, next to Calvin, the most significant figure of the Swiss Reformation and the Reformed Churches of Europe. Patrik Müller provides a concise, well-written and fluid biography profiling the broad sphere of activity of second-generation Reformer Bullinger: the unknown Aargau priest who succeeded Zwingli following his death and consolidated the fragile Zurich Reformation; the church leader and politician whose body of correspondence comprises some 12,000 letters to places as far afield as England, Italy and Hungary; the theologian who conceived the covenant theology central to the Reformed Churches; and, ultimately, the historian of the Reformation.