Bruce Greyson, M.D. (born October 1946) is professor of psychiatry at the University of Virginia. He wrote "Irreducible Mind" (2007) and "The Handbook of Near-Death Experiences" (2009). Greyson also wrote the overview of near death experiences for the "Encyclopædia Britannica" and was the Editor-in-Chief of the "Journal of Near-Death Studies" from 1982 through 2007. Greyson has written many journal articles and has given media interviews.