Dave Armstrong is the author of fifty-one books: ten published by major Catholic publishers, with several bestsellers. He has defended Christianity as an apologist since 1981 and Catholicism in particular since 1990 (full-time since 2001). His blog, Biblical Evidence for Catholicism, went online in 1997 and contains more than 4,000 articles. Dave has been a regular columnist for National Catholic Register since 2016, and has additionally been published in Catholic Answers Magazine, The Catholic World Report, Catholic Herald, and several other well-known Catholic periodicals.