 He earned a bachelor of arts degree from the Divine Word College at Epworth, Iowa, in 1968, and later earned a Master of Divinity degree at Catholic Theological Union in Chicago.He received priestly ordination at his home parish of St. Ann in Mallet on December 16, 1972, from Carlos Lewis, Auxiliary Bishop of Panama, also a member of the Divine Word Community.Guillory earned a master's degree in Christian spirituality from Creighton University in Omaha, Nebraska, in 1986.