Charles J. Callan (1877-1962) was an influential Catholic priest, theologian, and author known for his significant contributions to religious literature. Born in New York, Callan was a Dominican priest who spent much of his life dedicated to educating the faithful and providing spiritual guidance through his writings. He was particularly well-regarded for his work in simplifying and explaining Catholic teachings, making them accessible to a broad audience. Callan's works often centered on Christian spirituality, moral theology, and practical religious guidance. His book The Shepherd of My Soul reflects his deep commitment to helping believers develop a closer relationship with God through prayer, reflection, and biblical study. Callan was not only a prolific writer but also an esteemed scholar and professor at the Dominican House of Studies in Washington, D.C., where he trained many young priests. His collaborative work on The Moral Theology with fellow Dominican priest John A. McHugh became a standard reference for Catholic priests and seminarians, underscoring his influence in shaping the understanding of Catholic moral teachings. Through his numerous books, Callan left a lasting legacy in the world of Catholic literature, providing spiritual nourishment and guidance to generations of readers.