Analyses of Schaeffer as the major intellectual influence on Dominionism can be found in the works of authors such as Diamond and Chip Berlet. Other authors argue against a close connection with dominionism, for example Irving Hexham of the University of Calgary, who maintains that Schaeffer's political position has been misconstrued as advocating the Dominionist views of R. J. Rushdoony, who is a Christian Reconstructionist. Hexham indicates that Schaeffer's essential philosophy was derived from Herman Dooyeweerd, not Rushdoony, and that Hans Rookmaaker introduced Schaeffer to his writings. Dooyeweerd was a Dutch legal scholar and philosopher, following in the footsteps of Neo-Calvinist Abraham Kuyper.