R. G. Collingwood was Waynflete Professor of Metaphysical Philosophy in the University of Oxford from 1935 to 1941.

W. H. Dray is Emeritus Professor of Philosophy at the University of Ottawa; he has held visiting apptoinments at Toronto, Harvard, Stanford, and Duke Universities, among others.

W. J. van der Dussen is Professor of Humanities at the Open University of the Netherlands.