An essay from 1994 titled 'Ivan Illich, Postmodernism, and the Eco-Crisis: Reintroducing a "Wild" Discourse' and written by David A. Gabbard, has shown up on the Web, right here. (This website appears to be written in Turkish.) The essay originally appeared in a journal called Educational Theory.
Gabbard currently is on the faculty of East Carolina University. He is author of a 1993 book called Silencing Ivan Illich, A Foucauldian Analysis of an Intellectual Repression.