Karl Keating is the founder and president of Catholic Answers. He had been working as an attorney for several years when, on leaving Mass one Sunday, he found anti-Catholic tracts on the windshields of the cars in the church parking lot. He wrote his own tract in reply and distributed copies of it at the Fundamentalist church responsible for the anti-Catholic tract. That was the start of what has become the country’s largest lay-run apologetics and evangelization organization: Catholic Answers. (BTW, if you're looking for an organization to support this giving season, please prayerfully consider Catholic Answers! I support it, and I think you should, too!)

Bill Jackson is a Baptist pastor who currently lives in Vienna, Missouri, and who's biography has proved exceedingly difficult to find -- his personal faith testimony, however, is readily available. During his life he has done missionary work among Irish Catholics overseas from 1957 to 1974. He has authored a number of books, most of which are still in print.

Topic: Who is the Vicar of Christ?