Clément Vidal describes himself as a “big questions philosopher.” He is a researcher and an assistant professor at the Free University of Brussels in Belgium. Among his areas of study is the potential impact the discovery of intelligent alien life would have on society.

The Rev. Thomas O’Meara is a Catholic priest and professor emeritus at Notre Dame University. He is the author of Vast Universe: Extraterrestrials and Christian Revelation.

Frank J. Tipler is a professor of mathematics and physics at Tulane University and author of The Physics of Christianity and The Physics of Immortality, which argues that basic Christian miracle stories such as the Resurrection and the Virgin Birth can be consistent with the known scientific laws of the universe.