Johann Baptist Reus was a German-Brazilian Jesuit priest and theologian who lived from 1868 to 1947. Born in Pottenstein, Bavaria, he entered the seminary in Bamberg after completing his military service. Following his ordination in 1893, he joined the Society of Jesus and eventually moved to Brazil in 1900. He spent many years teaching theology at the Cristo Rei college in São Leopoldo, where he became a significant religious figure and a prolific writer on various subjects.