Francis Xavier Seelos was a 19th-century German Redemptorist priest who served as a missionary throughout the United States. Born in Füssen, Bavaria, he moved to America to support German-speaking immigrant communities. He held various roles, including pastor and novice master, and was noted for his extensive work in religious instruction and preaching. His ministry concluded in New Orleans, where he provided care to those suffering from a yellow fever epidemic, eventually contracting the disease himself and passing away in 1867.