F. J. Boudreaux

Florentin J. Boudreaux, usually published as F. J. Boudreaux, was a 19th-century Catholic author and Jesuit priest. Library and public-domain book records identify him as living from 1821 to 1894, and his best-known work is The Happiness of Heaven.

That book presents a reflective, devotional treatment of heaven and the beatific vision, aiming to explain Christian teaching in a readable way rather than as a dry academic argument. He is also associated with God Our Father, another religious work published under his name.

Little biographical detail was readily confirmed from the sources I found, so the safest picture is a simple one: Boudreaux was a Jesuit author whose surviving reputation rests mainly on spiritually focused books meant to encourage and instruct Christian readers.