Paul Ernest is a mathematics educator and philosopher of mathematics. He is professor emeritus at the University of Exeter, UK. His best known works include the books The Philosophy of Mathematics Education, Routledge, 1991, cited in more than three thousand scholarly publications, and Social Constructivism as a Philosophy of Mathematics, SUNY Press, 1998 (cited over 1000 times). For the past decade he has published extensively on ethics and mathematics. He founded and edits the open access Philosophy of Mathematics Education Journal, now in its 32nd year of publication, an open access journal located at http://socialsciences.exeter.ac.uk/e…