Jon M. Sweeney is an independent scholar and author of popular history, spirituality, poetry/mysticism, memoir, and young reader fiction. He's one of the most popular interpreters of the life and work of Francis of Assisi, the author of 30 books including many about St. Francis, such as "When Saint Francis Saved the Church," "The Complete Francis of Assisi," and "The Enthusiast," a biography Fr. Richard Rohr called "An immense and important contribution to our understanding of the great saint." HBO optioned the film rights to Sweeney's history about the medieval Celestine V, "The Pope Who Quit." Sweeney has been interviewed on CBS News, WGN-TV, Fox News, and CBS Saturday Morning. He lectures frequently and leads retreats.