Peter John Kreeft (/kreɪft/;[3] born March 16, 1937) is a professor of philosophy at Boston College and The King's College. A convert to Roman Catholicism, he is the author of over eighty books[4] on Christian philosophy, theology and apologetics. He also formulated, together with Ronald K. Tacelli, Twenty Arguments for the Existence of God in their Handbook of Christian Apologetics