Norman L. Geisler is a Christian apologist and an alumni of Loyola University where he graduated with a Ph.D in philosophy. A prolific writer as well as a debater, one of his better known works is I don't have enough faith to be an atheist, which he co-authored with Frank Turek.
In 1986, Dr. Geisler publicly debated the author of the Humanist Manifesto II, Paul Kurtz.[1]