Ong was born in Kansas City, Missouri, to a Protestant father and a Roman Catholic mother; he was raised as a Roman Catholic. In 1929 he graduated from Rockhurst High School. In 1933 he received a Bachelor of Arts degree from Rockhurst College, where he majored in Latin. During his time at Rockhurst College, he founded a chapter of the Catholic fraternity Alpha Delta Gamma. He worked in printing and publishing prior to entering the Society of Jesus in 1935, and was ordained a Roman Catholic priest in 1946.

In 1941 Ong earned a master's degree in English at Saint Louis University. His thesis on sprung rhythm in the poetry of Gerard Manley Hopkins (see An Ong Reader, 2002: 111-74) was supervised by the young Canadian Marshall McLuhan. Ong also received the degrees Licentiate of Philosophy and Licentiate of Sacred Theology from Saint Louis University.

After completing his dissertation on the French logician and educational reformer Peter Ramus (1515-1572) and Ramism under the supervision of Perry Miller at Harvard University in 1954, Ong returned to Saint Louis University, where he would teach for the next 30 years. In 1955 he received his Ph.D. in English from Harvard University.

In 1963 the French government honored Ong for his work on Ramus by dubbing him a knight, Chevalier de l'Ordre des Palmes académiques. In 1966-1967 Ong served on the 14-member White House Task Force on Education that reported to President Lyndon Johnson. In 1971 Ong was elected a Fellow of the American Academy of Arts and Sciences.

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