Paul Kurtz was an American scientific skeptic and secular humanist. He has been called "the father of secular humanism". He was Professor Emeritus of Philosophy at the State University of New York at Buffalo, having previously also taught at Vassar, Trinity, and Union colleges, and the New School for Social Research.

Scientific skepticism or rational skepticism, sometimes referred to as skeptical inquiry, is a position in which one questions the veracity of claims lacking empirical evidence. In practice, the term most commonly refers to the examination of claims and theories that appear to be beyond mainstream science, rather than the routine discussions and challenges among scientists. Scientific skepticism differs from philosophical skepticism, which questions humans' ability to claim any knowledge about the nature of the world and how they perceive it, and the similar but distinct methodological skepticism, which is a systematic process of being skeptical about the truth of one's beliefs.