If you search for "Christian" and "yoga" in a library database or Google, you'll inevitably run across a book called Christian Yoga by Fr. Jean-Marie Déchanet. Originally published in French in 1956, Christian Yoga is one of the oldest books available considering the intersection of yoga and Christianity, and in many ways, Fr. Déchanet became the Father of today's movement of Christians practicing yoga.
So who was Fr. Déchanet?