Ulrich Gabler's substantive biographical introduction to the life and work of Huldrych Zwingli includes a comprehensive account of the social, political,, and religious backgrounds of the Zwiingli-initiated Swiss Reformation.
Dry, but short & insightful. Zwingli's influence parallels his life, quiet, almost forgotten, but unmistakably there. Reformation historian Timothy George even quipped of Zwingli that he put the *Sola* in *Sola Scriptura*.