D, Eban Alexander has taught at Harvard Medical School and has earned a strong reputation as a neurosurgeon. And while Alexander says he's long called himself a Christian, he never held deeply religious beliefs or a pronounced faith in the afterlife.
But after a week in a coma during the fall of 2008, during which his neocortex ceased to function, Alexander claims he experienced a life-changing visit to the afterlife, specifically heaven.

http://news.yahoo.com/blogs/sideshow/heaven-real-says-neurosurgeon-claims-visited-afterlife-213527063.html