Henry van Laer was professor of philosophy at Duquesne University from 1956 to 1962.
Henry J. Koren (1826-1913) was born in Germany and immigrated to the United States in 1848. After studying at Gettysburg Seminary in Pennsylvania, he was ordained in 1851 and began his ministry in Baltimore, Maryland. Koren was a prolific writer and editor, publishing numerous books and articles on theology, liturgy, and church history.