 Villoro’s position has been criticized by Guillermo Hurtado (b. 1962), a professor at the Universidad Autónoma de Mexico who obtained a B.A. in philosophy at this university as well as a B.A. and a Ph.D. in the same field at the University of Oxford. Hurtado (2003) argues that Villoro’s epistemic relativism and his redefinition of the concept of knowledge are the result of the fact that Villoro grants the skeptic the unacceptable view that, in order to be able to claim that one knows that p, one must have an infallible criterion for knowing that one knows.