C.S. Morrissey wrote on the career of John Deely at B.C. Catholic.
"He soon moved on from various academic posts to his first major career accomplishment: to work closely with the renowned philosopher Mortimer Adler, at the Institute for Philosophical Research, from 1969 to 1974.
"A fruitful philosophical disagreement between Deely and Adler resulted in John going his own way. He needed to continue unhampered his investigations into the history of semiotics in the Middle Ages: i.e., how philosophy and theology tried to explain the functioning of biblical and sacramental 'signs.'
"'I am indebted to him and regret that unresolved differences of opinion between us about certain aspects of a theory that we otherwise share prevent him from associating his name with mine in the authorship of this book,' wrote Adler in the preface to Some Questions about Language: A Theory of Human Discourse and Its Objects (1976), which they had originally begun writing together."