update Apr 27: In the way of tx to John for his contribution below, blog version of a conference panel response of his relating to Ong’s work

Father Walter Ong (November 30, 1912 – August 12, 2003) is turning 100 just a year after Marshall McLuhan, his PhD MA [giving the floor to John Walter in Comment below] thesis mentor.

A short, to-the-point review of his likely best known book:
Orality and Literacy: The Technologizing of the Word (1982)