Tetlow, Joseph A.: - JOSEPH A. TETLOW, SJ, has practiced, taught, and written on discernment since before Vatican II. He is a spiritual director and has led numerous retreats for laypeople on the topic of discernment. Often hailed as a "world authority" on Ignatian spirituality, Fr. Tetlow is the author of many books, including Making Choices in Christ and Choosing Christ in the World.