Randall C. Zachman (Professor of Reformation Studies, Notre Dame) is one of the finest historians of the Reformation today. Professor Zachman specializes in the theology of the key figures of the Reformation, beginning with his brilliant study of Luther and Calvin published in 1993. There is a serious concentration on doctrinal nuances in his work, which makes his historical monographs especially useful for the student of dogmatics.
For your reading pleasure, I point you toward this essay I recently discovered at the Institute for Reformed Theology:
“The Generosity of God: The Witness of the Reformed Tradition” by Randall Zachman
I especially appreciated his use of Zwingli, along with Calvin, in bringing-out the themes of goodness and beauty in Reformed theology.