Scholars have increasingly recognised the importance of figures other than John Calvin and Huldrych Zwingli in the early formation of the Reformed tradition. Richard Muller, a chief authority on the development of this movement, has argued that Vermigli, Wolfgang Musculus, and Heinrich Bullinger were as influential if not more influential than Calvin on the development of Reformed theology in the sixteenth century. Vermigli was a transitional figure between the Reformation period and the period known as Reformed orthodoxy. In the Reformed orthodox period, the theology first articulated by Reformation figures was codified and systematised. Theologians increasingly resorted to the methods of scholastic theology and the tradition of Aristotelianism. Vermigli was the first of the Reformed scholastic theologians, and he influenced later scholastics Theodore Beza and Girolamo Zanchi.