Twentieth century Calvin scholarship saw the rise of a theory that there was a stark theological divide between John Calvin and his later followers. Basil Hall, Karl Barth, R. T. Kendall and others have posited this view, and in a lot of circles it is bought into.
Richard Muller, historian at Calvin College, has written much to debunk this thesis. His works on Christ and the decree, Calvin and later Calvinists and his magisterial four volume Post-Reformation Reformed Dogmatics are just a smattering of ways in which he’s demolished the “Calvin vs. the Calvinists” school.
My friend David Daniels, who writes at Wise Reader, has a great review of the four volume set at the Christian Week website. Read the review and if you’re so inclined, buy Muller’s works. Here’s a quote:
Muller will require focused, disciplined reading. But those who invest the time will find rich reward. And the 123-page bibliography of primary and secondary sources will provide a lifetime of further research for those so inclined.