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.
Richard Muller, seorang kepala otoritas pengembangan dari gerakan tersebut, berpendapat bahwa Vermigli, Wolfgang Musculus, dan Heinrich Bullinger berpengaruh jika tak melebihi pengaruh Kalvin pada pengembangan teologi Reformasi pada abad keenam belas.