This is the first comprehensive study of Zwingli's theology in English and the first extended presentation of the theology of this Swiss reformer since Pollet's work in 1950. Making use of the main secondary studies in German, French, and English, and drawing from the whole range of Zwingli's writings, the book covers the central themes of his theology--unfolding them historically as well as systematically--and sets his thought in the context of his life and ministry.