Monsignor Glenn was a staunch defender of the Catholic Faith, often using his genius writing talents to do so. He was a witty teacher at St. Charles Preparatory School and Seminary, and served as the rector and principal from 1945-1957.
He authored what is arguably the best series of undergraduate philosophy textbooks ever written. The most popular of his writings would be the Tour of the Summa. This book is a clear road map, guiding one on a journey through the genius of "The Dumb Ox" also known as St. Thomas Aquinas.
If you seek truth in philosophy, or simply wish to understand what your professor is confusing you with, get the philosophical works of Monsignor Glenn, for they are a light in the darkness of confusion, guiding you into deep understanding!